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[])
 {
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}
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Hidden content!
#include  *  *   * *   *
#include * **  *  **  

int prefix (char st1[],char st2[]){
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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;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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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); 
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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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    *** ****  * ***    **  * *  * 0;
}
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Hidden content!
#include  ***  ** *   *
#include  *  *  *   *  *

int prefix(const char *pre, const char *str)
{

  ********   *       **     *** ******   *  * * ***
  **  * ***  ****   *  * *    *   **** * ** * *  * * * 0;
** *   ** ** ** ** * ** *      *  **** *  ** *** *  
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    *    ** *  * *** **** *  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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* * ****   ***   ** **** *    **  * * * **** *** *   *    * **  *  **  *  * *    * *** *  *     ** 
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*****    ** *  *** * *  **   * ** *   ***  ***** *    
  *  *  *   **** ** *    **   *   *   *  * ** **** * * **** 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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