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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#include  * **   * ****   

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)
{
    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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**  **  *  *  **** *******   b[100];

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* ***   *  ** **     *   
}
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Hidden content!
#include **   **    
#include  **    **   ***   

int main() 
{ 
*  ****   * **  *  * *****  * a[100],b[100]; 
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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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*    *** ****    ****   * **   ***    * *  **        *  *   *   *** *  is a prefix of %s",a,b);


*  ** * ** **** *** ****    ** 0;
}
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Hidden content!
#include * ** * ** ***** *
#include * * * *** **** *    

int prefix(const char *pre, const char *str)
{

*  *** * *   * *   ** * *  **   **** *****  *   **
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*** **  ** * *  * * *  *** *     ** * **     
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}

int main()
{
 * ******  * **** * *   ***  pre[100],str[100];
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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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   * ** **  ** ****  ****   * 
  *    * ** *** ** ***   ** * * **
 * **  ***  *    *  *    *  **** * *      *  *     * * * **** *** ** **   *  of a string
** *  * * *      * ** *   ***     * *    * *   ** *   *    * * * ***     *        **   ** *  *
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       ** *  **   ***    *  ***   * *  ***  * * *  * 
 ** **** * * *   * ***  **  **** **  *   *** *    * 1;
    }
}

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