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);
         ^