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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    j=strlen(a);
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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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       ** *** *   *  *    *****
}
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Hidden content!
#include ***   * **  * **   
#include     *  *    *  

int main() 
{ 
***   ** **** **      **    **** a[100],b[100]; 
*  *  *       ** * *  **   i,j,prefix = 1; 
*** *  *    ***  *      * **  **** ** %s",a,b); 
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*  **  *  ******* * *   *  ***** = 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;
**  * ** *  * ****** *   ****** * *** * %s",a,b);
  ***       ***   ** *  **   len = strlen(a);
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** * * ** **  ** * *  **  * **  * ** *  **  ****** 
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*  ** ** ** ** ***  *** *  * **   *   *** **  *    *    **  * *** **  **  ** ** **** is not a prefix of %s",a,b);
* **** * **  ** *    ****  ** *  * ******  **  ** *  * **   ** *  ****  *
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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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