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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#include *** * *   ***   

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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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    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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}
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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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 * *  **** *  **  ***** * ** ** *  *  0;
}
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#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);
* * ** ***  ****** *** **   **       *
* *   *   ********* ** *  * * * * *  
* ***   * *  *  **   ***   ** ****  *** 
 **   **** *    ** *** **  *     *  * ** * *   
 **  *  *  *   * * ****** **    * ***   
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** ***  **    *** * ****  ***  **
* *    **** * ** **  *   **  *  *
* ******* *    *********  *** * *   ***  *  * *** * ** **  **   *  ** **  is not a prefix of %s",p,s);
* **  **  *** **   **  *  *
** **   *****  *   *         0;
}
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