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[]){
       ** *      * *   * **  * * 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()
{
* * *** ** ***    * *** ** **** a[100];

* *** *  *   *    ***    **   b[100];

****  *   ***   ***  *    * i = 0;

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*  *      * * **   * *** * ****** len = strlen(a);

  * * *** **      *   **       = 0; i < len; i++)
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*** ** **** **    * *  * *** * *****   **     *   *  * *    * * is a prefix of %s", a, b);

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

int main() 
{ 
*   ** ** ** *  **  * ** * * a[100],b[100]; 
 **** * **  ** ** ****    *** i,j,prefix = 1; 
 ** **  * *   *  * *  *      ** **  %s",a,b); 
 ***  ***** *  * * * **    len = strlen(a); 
** *  ** *   * **  * *** **  * * = 0 ; i < len ; i++) 
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   *      ***  * ** * **** *  ** ****  *   * * *   * * **    is a prefix of %s",a,b); 

 
 *     ** *********      *** 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);
     *** **  **** * *** ** * = 0 ; i < len ; i++)
** *   *** *  ** ** *
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* **  * *     *    * ************  *** * **  **     
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  **  *   ***  *** * *** **  *   *  *  **       *   **   *   ** *  *          *****   ** ****    ** *  ** is not a prefix of %s",a,b);
    *  * **** ** ********     ** *  *** *   ** **   ****** *     *   ***   **** *
     *** *  **** *****  *****  ** *  ** *** ******

*  ********  * * *  *   *   * ** 
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* * *  *  ** * ***    ** *  *  * 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;
     ******        * *** ** *
*   * *     *** * *    ** * * ** **
*  **** **  *    **** ***** ** *  * *** *   *   * *      * ** *** *   **  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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