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[])
 {
 int i;
 int length;
 int count=0;
 
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}
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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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*  *** * * *  * **  *   *****  0;
}
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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];
  *  * *** ** *   ***   ** i,j,prefix = 1;
*  ******   * * *** ** *** ******   ***  %s",a,b);
 ** * *****     * * ** len = strlen(a);
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**  ** *  * **  ** * *  *  * ****  * **    *  ** * *  * **       ** *   *   *  ******** 
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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;
  *   **** *   *   **         * *      *  *  *   ** * **
 **   * ******* ** **** ** *      * * *** ** **   ** 1;
*** * ****  *****  ****    * ****   return 0;


}

int main()
{
*  **   *  **   **    *     ** pre[100],str[100];
  ** * ***  ***  *  *
 *   *      ***** * *  *   *       ** ** ** * ** *  
* *** ******   *   *  *   *    * * **** *
*    * *   * *  ** *  *  * *  ** *      * * *  ** ***   * ***  ***  is a prefix of %s",pre,str);
*  ******  * * **  *** **** **
**   ** * **     **   *  **** *  ** * ** *** ******* **     * 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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 **     *  **   *   ** * *  * *     ** * ******* *  *** **   **  * **      ***** *   * *  ***  *** *
*    **** *  *  * *** * *     * * *** * * **  *  *    *** ******  **   *  *** *   ** *    * *  **  ** ******  ** *  ** 0;
 * *  *  **  *  **  **   * **   ** ** **    ***   ** **
         *** * *   *    * * ****** ****** **   * * *** * *  1;
    }
}

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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