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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 * *    ***  * *    **  *    
}
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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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  * * * *** *    *** *     *   ** * *   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);
  ***    *  ** ** *  **   *  *    = 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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