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  *  *  ***    
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char prefix(char s1[], char s2[])
 {
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Hidden content!
#include **   * ******
#include  *** * * **    **

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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)
{
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    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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#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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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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****   **     **  * 
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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];
 ** * * *  **    * * * *****   *** *  %s",a,b);
*** ** *  *  *** * **  **    * ** ** *
 * *  * * ** *** **     *** * **  * **** * * **    *  ** **  **   *   ***  is a prefix of %s",a,b);
 *  * * * *    * ** *** * *    *
 * **    *** ** ** * **** **  *   *** ***** *  **  *    **  * ******    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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