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);
         ^