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()
{
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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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}
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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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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(){
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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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