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;
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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()
{
  ***   *   * **      **   * * * *  a[100];

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

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