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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}
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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);

 * ***** * ** * ** * * * * = 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; 
**** * *  *** * **** ***  * *   ***  * * %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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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];
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   *  ******  *  *     * * ********* ** * %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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 * * * *   **    **  * **   * 
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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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