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