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[])
 {
 int i;
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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]; 
* *   ** **    ****** **  * *   i,j,prefix = 1; 
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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)
{

** ******  *******  ** * * **  * *  ***   *****  *
***   *    **  *** * **  *  ** * *  ** * **** *****  *     ***     0;
* **      * * ** * * * **   * ***** *   *****
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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;
      *  **     *** * *****   * ****  *   **  *   
 *** **** * **** ***   *       *** **   * * **    ** 0;
  * *  ** ** ***** *  *   
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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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