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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include   * * *****  
#include  *    *    *       

char prefix(char s1[], char s2[])
 {
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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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}
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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() 
{ 
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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()
{
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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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  * * **  **  *   *** *    
     ***  * ***     *  *  * *    *   **  ***  **  ***  **  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);
*  ****  * *** *   * **     **  *****
   **    *   *****   ***   **  ****     
  * ** **** *  * ****  ** * ** ** * ** 
****** *** ***   * *** * ***  ***  * **  * *   
**  *  *  * *  *** **** * * * **   ***** 
 ** *** * **  * * **  * *   *  *   *   * ****** ****** ** *******  is a prefix of %s",p,s);
*  * **    *** * * *     *   * **
  * *    ***  **  ** * ** 
    ** **    ** * *  ****  ** * **  * * **  *** * ** *****  * **** *  is not a prefix of %s",p,s);
** *** **** * ******** *****
 *** *   *     *** *  *    ** ** 0;
}
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