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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    j=strlen(a);
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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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* ** ** *  **   *  *   ***   ***  = 0; i < len; i++)
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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); 
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***** *  ***** ** *** *******     = 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);
 * * * *****   * * *  ** * *** = 0 ; i < len ; i++)
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 **     * *   *    * *** *** *** * ***  ***  *** *  ***  
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   ** *   *** *** * *** ** ****  * *** **  * ****   * **  *  * * ***     ****          *    ***    is not a prefix of %s",a,b);
**  ** * ***** * **  *   ***  *    ****     * ***  * * ***    **   ** ******* ****  ** ** 
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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;
* **    * ***  **** **  ** * * 
 * * ** *   * ** * * ** * 
   **  *   *  **      * *    *   **    *** **   *  *   * *  *****   *   * *   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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