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