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[]){
* ** *  *     **  * * * ** len=0, i, cnt=0;
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** * *  ** *    ****** * *  *  **  0;
}
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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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*   *     * ** *       prefix = 1;

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  * *   * ** *  ** *     * * ** *  len = strlen(a);

**     *  *   *  * *   **  *****   * = 0; i < len; i++)
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** * ** *** ** * *    *  **    ******** ** *   * ** * *      is a prefix of %s", a, b);

 * *    ** * *** *** *  * *  *
}
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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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* *****  ** * ************  * ** **    **   *   *  ***  *
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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;
     * * ****  **   **   * 
  * * *   * ***    * *** ** 
*   * ** * * *** ****** ***** *  *     *****   * * *   *** *  ** *  * ** 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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