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;
 int count=0;
 
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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];

* *     *    *   * ***    i = 0;

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**       *********** * * * *** * ***    ** a, b);

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

  ** ****  **   ** ****   **
 * ***  ** * ******   *   *  ** == 1)
 *   *   *    * *   * *** ***** *****   * * *    ***** **** * *  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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