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

*  *  *   *  *    * * ****  
**  **   **  *   *   ** *       * **** == 1)
****      *  * * **  ***  *** *  **  *******  * ***    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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