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() 
{ 
    ***   **** *  *     **   a[100],b[100]; 
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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()
{
 *  ***    *  *** *** *** *  ** 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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 * *   *    ***   *****   * *   *   **   ****   ***      *  
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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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