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

int prefix (char st1[],char st2[]){
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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];

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* *  **  *    **** **** ** *  *****  ** *****   a, b);

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