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

int main()
{
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 **** * *  ** * ** *   ***   b[100];

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

int main() 
{ 
** ** * **    ** * ****   a[100],b[100]; 
   ** *  ***     *  *   ***** i,j,prefix = 1; 
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*    * ** ** *  ** * *   * ***** * ** = 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);
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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;
**** *** ** **  ****  **   *  ***   * **  ***  * * 
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*  * *   **  * **   *** * **  * ***  return 0;


}

int main()
{
 ***   * *    *  *   * *  *     pre[100],str[100];
**  ** **       *** * 
 *   **   *** ***  *** ***  ****   *****   ***  
  ** **  *** *****      * *******     
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 ***** *  ***   ** *** *  ***** 
**   *    *    **** *   *****    *  * *** * * *   * *** ** **** *** ** 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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* ****    **   ******  **  *** **  **** ***   * * * ** *  *   *****  ****   ***   **  *   * *
****   *   *   *****   * * ** ***  *  *   **** * *   ****  * ***  ***   * *  ** **** ** **** ***** **** ** **  **  ** 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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