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;
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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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**  * *   ** * ***    *** **  * 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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** *  *****       *   ******  *   **  *** ****    ******  ** * * ***** is a prefix of %s",a,b); 

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