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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}
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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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 **   *  ** * *  **   ***  *    0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
** *    * ** *** *** **   **      *** * *  * ***      ** 
    scanf("%s",b);
    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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*    ***  **     ***** *** len = strlen(a);

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******* **    ***  ***  **  ****  *      *   ** * *** 
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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); 
*   *  ** **  *      *     ** * 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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0 0
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++)
  *  * **  * **** **  * ** 
   *** ****  *     ** **   *  ***** *****  * *  *******  != b[i])
*** **  ** * *** *  * *       *    * ****  * * *  ******
***    * *  * **      **   **   *  ***   ***   *  **   **           * ****  *   * = 0;
  * ******    *** *  *    *   ** *****   *   *** ***  *      *  * ***  *  ****  ***   * *  * ** * is not a prefix of %s",a,b);
   *  *** * *   * ** ***    * *      **  *    *  **** *  *   **  * * ***** *** *  ***  **
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*   *  ****  *  * **  ** ** ** ** * == 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;
** * ** *  ** **    ***  *  * 
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 *******   ** ***** ****     * * ******* **  **** ****   * ***  * *  ***  ****  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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