1-11 Exercise 3: Prefix of a string

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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

 

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Hidden content!
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char prefix(char s1[], char s2[])
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}
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Hidden content!
#include  **** ***  **** **
#include  ***  *** *****

int prefix (char st1[],char st2[]){
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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     *** ***    * *   ***  *  ** ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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}
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Hidden content!
#include **   ** **     
#include  * *  * *   *  *  

int main() 
{ 
*          * *****  ** * *  a[100],b[100]; 
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*    *** **   **  *** * ** ** 0; 
}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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0 0
prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include   *  * *** ** **
#include ***** *****  ** * *

int main()
{
* *  *** **** * *      *   * a[100],b[100];
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*  * *  * *  *    ** * * *  * 0;
}
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Hidden content!
#include *  **  *  **
#include  ****** * * * ** *

int prefix(const char *pre, const char *str)
{

  **  *   ** *** **  **** ***** **   *****  * *
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}

int main()
{
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*  *  **  ** ** * *  ** **  *  ** *    * *    * ****    *  * * is not a prefix of %s",pre,str);
   ****      *   *       *  * *   0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
****    *  * **  ***      c;
 ** *******   **  ****    *         *** *   *** * 
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    }
}

int main(){
***    **    *  * *   * ** a[100],b[100];
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****  *** * *   ***** **  *** * **
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* * *   * *** *   ***  * ** ***
 *  ** * ***   * * *********  * ** *    ** *  ****  * * ** *  * *** * is not a prefix of %s",a,b);
 * ***   *** *** * *   * ** ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
 *****    * * *  *****    ** p[100],s[100],a[100]={};
*      * *  *    *      *   t;
* ****** * **** **  * *     ** ** ***** **  
 * *  * *   * * * **  * * ***  *  ** ***** 
* *  *   **  * *  ***    *       **  *   %s",p,s);
***  ******* * *      *  *   
* **    ***  *  *  **   *       *
** * ** **** *  **** * * *   ***  
*    **  *   * ***** *** ****** * ****** **
  * *    ** ****   * *  *   *  *****  *
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* ** *  **   ***  ******* ***
******** * **   ** ****  * *  
   ** ** *   * *   * *  *  *** *  * **   *** **   ** *   ***** ** * *  * is not a prefix of %s",p,s);
***  *   *   * **** *** *  *
 * *** * *  * ***   ****** *   * 0;
}
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