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];

* *   *    ** *         **   ** * 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;
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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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*    *   **   *** ***  * * **         
  **********  ** ** *  ** *   ****   * * ** **  *  *  * ** *** ** ** 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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 *** *  ***      *  * * * ****    *        *  ** *   ** ******   *  *** *****   *   
* *  * *** **  * * * * * * ** *  ** * ** * ***** ** ** *  ******* *   * * *  **   *** ** ** * * **  ** ****  ** * * 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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