Final Exam 2 (20%)

Question

A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

Answer 1

Hidden content!
 ***     ******* ***   *
****** *  *    *  *   *  * 

int main()
{
    * *** * **  ** char  *** *** **
   *       ***  int i,c=0;
*        * *     * ***     ** ***  ** * **    *
    **     * **         * **  *** **** **  ** 
 *    ** **     **  *  ***  *  * * * * *  
  * *  ** * * * *  {
      *  * ** *  *** *  ***  *** *
 **** *    * **        ** * **** {
       * *  ****     ****     *  ** **** * **  * *    ** * * *  *  * **  * ** ** 
 * ***   **  * *   **  *   *    ***  *  ** *   **  *** ** *    {
*   * ***                  ***       c=0;
 ****  **  **  ** **     *** * *  * ** * **   **** *  **   }
**  *  **  **  *   * *****  **  *    **         **   else  ** *  **** * **      **  ** *
**  *     ***    ** ***  ****  *  **    * * ** * * **       *** *   {
**  * ***       ** * **     * * *   * * * *   ***      **  *   *** * *** **  *  c++;
  * * *   ***  **  ** *  * **  *** *** *    * *  *      * *   }
 ***** **     * * ***  *  ***  }
**  ** *****   * 
**   *     *    if(c==0)
 * *       ** *     ***     * * *  **   ***      *   *  is not a prefix of  ** *** **** 
*  **** * * * ** else
   *** ***  * * *     ** * ** * ** * * **         ***  is a prefix of  *   * *   **
 ***** *     * * }
***** *  *      ** return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
 ****  *** ****   * *
*** ******    *       * *
int main()
{
*    ***** *     ap;
**    *    *  *****    ** **   *   ***** *  || ap=a)
     ***    *  *  * *** ***   *   *****   **** is a prefix of abcde\n");
 ***   *       *    
  ***     * *   
   *   *  *     *   *  **** **        * is not a prefix of abcde");
* * * * ***** ****  *    * ***** * *****  * *     *   **  *  *** * *  *   ** * 0;
     **   * * ** *****  *** *    *  *  * *  ***  *   * *** *  **** ****** 
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

Hidden content!
*   *  * **   **    **
  *    **    * *     **

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
 * **       *   **  * * ***   **  * i<pl; i++)
 **   *     * ** * ***    *  * *
** ***** * *    *** **  **  *   *      **  *  **  ** ***   * (p[i]==s[i])
  *  ********  * *   * **   *  ***  * *  ***  **** **   *
* ***    ** **       * ***** ***    *** ***   * ****  * *  ** *     *  ******  * *
*  *   ***     * *****   ***  *    * * **** * ** *   ***  *    *** * ** *** ** *   **
****** ****  * *  *  * * * **** *  * ****   * *  **  ** ***   ** *    *  *     * *     **  *     *** ***** * **    ** 1;
 ***  ** *    *   **   *  **  **    * * **   ***  *  * * * ** *  *  *   **   *   * 
** * *** * ****************   *  *     * ****  ** ***  *   *
   * **** *** * ** *  ** *      **** * * **** *****    * if(p[i]!=s[i])
** * *  * *  **    ***  * * ** *  * * *   **     * *** 
* ***  * ** ****    ***    ***  ***    **  *** **   ***** * *       *    *****  0;
    ** ****** * * ** *  * **** *  ****  **** **** **   *  *
 **  **  *   *      *    
}


int main()
{
 *       *  * 
  ***** *** * * 
***  *  *    ** ",p);
*  ** *  *  ***** *   * 
*  ****   *      *** *

sl=strlen(s);
pl=strlen(p);


* * ***  *** && pl<sl)
{

 ***   *   ** *     ** * *    * * is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
  *  * **  ****  * ** *    * *** a[99],b[99];
    int l,i;
* * ********* *   *  ****  * *   *
 *    ***** *    ***   **     ** *  *  ** **
*   **   * *  * *  ** *   * *    * * *  ** 
 ** **** *** **  * *  *      * * *
    {
 * ** * * ** **     * *   ***** * *   *  * ** *   ** ***    *** * ** *   
   ***  ****  *******     *   * * ******     ** * *  
*  * **  * *     * ******    * **   *   ** * *      ** *******  *  ** ***  *    *  **** * * *  a prefix of %s",a,b);
***  * ****   * *   *  *** * * *    **** * *  *** *      * * ***  **   ******** * * *
 **     *  *      * *  * *   * * *** *  ** ** **   **
*   * *    ****   * ****   *** ** *  * * *  * ***   * *  * *  *
*    *  ******* *  *   *** *    **  ** ** *** * **
 ******** * ***  ** *    *  * **    * **    **  *  *** ** * **   **   * ** * * * *     * * ** not a prefix of %s",a,b);
*  * *** * **  *  ** * * ***  *   * ***        **** ** ** **   * * * * ***** *** **   * **  
**   *   ** **  * **  **   ****   *    **   * * * *** ** 
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
  ** ** *   ***  **  *    ** i;
  **** ** ** *  *** * *** *** count=0;
 * * **** **** ** * *****  * len;

 *  *   *  * *** * *  *     ****

 **   *    *  **   **** ***  * *   *** *       **
* ** ** ** * * * * *  *   
* * * **  **** *     **    * * *** ** * * * * ** *   * *
 *    *     *  ***   ***  ** * **  ********  * * * *   
* ****** **   * *  * * *  ****** ***  **      ** *  *  ****** *   *    ** * * ******  
 * ****   **  ****  *    ***  * ****  * **  ** * ** * ***  *
** * ********* * **   ******* 


**** ******  **  *   * ***    *  *
  ** **    *     ****   **
************ * ****   * *    ****   * ****  ***  * ** * * 1;
** * * *  * *   *    * *   **
*  *****   *     *** **** **  *  

   return 0;
}


int main()
{
***** **   *  ****   **  *  ** a[100];
 * ******  *  ** ****   ** **    b[100];


* *** ***** * ** * **** * * **   *  ** ** ** * *    *  *   
* *   ** *** **** *   *  *    *    ***** *  *** *****  *

 * ** **  *   ** * * * *** * **     *
** *********  ** *** ******   * ***  *   *

     * ********   * *    *    *  ***** 

 {
 *** * *      **  *  * ** *  *  ****  ** *   *** ** *****  * *** *  is a prefix of %s",a,b);
 **   * * ** *   **
 **** **  *  ** *  **     **** 
   * **  ** *     * *   *** *
  ****** **** *  **  **  * ***** *  *  **** *******     *  ***   **  *   * ***** is not a prefix of %s",a,b);
    **  *  ** **    *  *  * 


  **   **    *** **  * * *   *  0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
*    *      ***        
 ** ***   * **  ***  *   **

int *
{
 ***** * *  **  **  ** * *  *  **     no idea, I *   even do it in the  **   * *** ** 
*** * *    *** * ** ***  *  *     0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include ** ** *  ** * **  
#include  * *** ** * *  
#include * ** *    *** **

int pref(char[],char[]);

int main(){

***  ***     *    ** ***** * p[10],s[10];
 ***   **  ** * ***    *    num;

*   *****    * **    **  * ***     ****  
     ****** **  * **** * **  * *  
*  *** *     ** *****          * ***  ***   ***  ** * *
 *  * ** * ****** *** *   **  **   * * *        *  *  *

***  ***  *****  * **   **** = pref(p,s);

**  * * * * ******* **  *** * **** *
           ** **** *** *** *      *   *  ***  ** ** * * ***   * * ** * is a prefix of %s",p,s);
** * * * ***  *** ****  * * ***    
*  *********   *     ** ***    *** * * **  **   *   ****   is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
**       ** **  ** * *     i;

*    ***   *     * * * * *** ** *  * * * *
       ** ******  * * * *   * **   * *   *** *** ** **   **  **  ****** *  * *** * *** *    * *   **   
  ***   *   *    * ** *   ** ** *** ******    **   ** **  * *** ** *****  * *      ***  *** ** **  *****  *   is a prefix of %s",p,s);
*  **  *  * **       *   * ****  * ***   *    *  ******    **   *    
** ******  *  **  ***  * *     *     **** * **** *   *** * * ***** *    **  *  ***  **  *   * is not a prefix of %s",p,s);

*  ****  **  *   *** ** *   ** *

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
  * **      *   **   *
  *******   ** ** * * 

int main()
{
*   *  length1,    c;
  * *   * a[100];
***   *    *  b[100];
*  ** *  ** d[100];

**    **  ****      *   ** ** * 
* *  *  *** **** *  *    * **   *

 ***   ******     

*  * *  *** *    ***** *

* *  *** *     ** **
 **** * *
*  *     ** * *   ** * * * is a prefix of ** **  * *   *
 * ****
 ******      ** *
       
****   * * * ***   *      is not a prefix of  *** *    
 *       

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
  *****   * * *     
*** * **      ** *  *  * *

int main()
{
 * **   ***  *   ** *     *** str;
***** **   * * *** * * ****    *  i, p, s;

*  *   **  ***** * *     *    ***  * * ***   *  &p, &s);

**** *** * ******  ** * *  *** (i<=0; &p; i++);
   * * *************    *  ** *
*   *  * *  *   * **  * *   *  **       ******* &p);
**** *  * *       * ***    ****   ***   *      ***
* ******* *  *  ****** *    
 * * ***  * **   * ***   * 

*****   *   **** *  ********     0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
 **  ** * *  *  ****
 ****** **** **   ** **
int main (){
char   **** **
char  **    
*   ***  ***  **  *  ** ** * 
*    ****** * *  **    * *******   
 ******  **** **   * *   *      *
 * * *  * * *  ***** ** *   **  * *
* * *   **  ******
 * **  * ****** is a prefix of *    *   *     ** *   
}
else{
**  *   *    is not a prefix of %s  *   *  *** *  
}
 * *** 0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^