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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*  *** ***    **  * *     **  **  **  * * * **  *




}
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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;
}
answered by (-281 points)
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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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 *   * *** ** ** *** **  * * * ** **  * *  **   * *   *** **   * * is a prefix of %s", a, b);

  **** * ** *   *** *       
}
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Hidden content!
#include    * * * *   * * 
#include *  ** *    ** **  

int main() 
{ 
 *  *     * * *  *****  * * **   a[100],b[100]; 
* *  **  * * * * *  **** *  i,j,prefix = 1; 
    *    **   ****    *  ****** ***  ** %s",a,b); 
  ****  **  ***   * *   * ** len = strlen(a); 
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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];
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   * *** *  * * *  ***         * * * * %s",a,b);
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 *   *  ***     **   * *  *  = 0 ; i < len ; i++)
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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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