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

int prefix (char st1[],char st2[]){
**   ****** ** * *   *   len=0, i, cnt=0;
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** ********** *   ***  **    * *  0;
}
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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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*  ***      ** * ** ** *  ** * * b[100];

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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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  *** ** ** **  * *** * * *** len = strlen(a); 
  ****   *   *****     **  ** *   = 0 ; i < len ; i++) 
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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;
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   **** **  *** *    * * * ** len = strlen(a);
 *****      ****    ** * * * *  *** ** = 0 ; i < len ; i++)
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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;
**** **** ***  ***   ******** ** * *    * *** *    * * *** 
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* ***  **** *  *     *     ** ** * return 0;


}

int main()
{
 * *   **     ** ***  * *  * * pre[100],str[100];
 * * * *     * * *
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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;
 *  *  ** **   *    ** *   *  ** * ** ***  * * **
** ** * ***  ** * *** *   ** *** ** *  *** **  * ***    * 0;
 *****    **  *** **     
***  ***  **** *  ***  * * *    ***
* **  * ** * ***  *     *   ***     ** **   **    *  * **** * *       * **  *   of a string
**  ****  ** *      ** *   *  ****** *** ***    * * ** ** * * **   *  **
  *  ****   **  *         ***    * **  * *  ****  * *  * **** *** ***  *  **   *** **   ** * **  ****     * *** ** 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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