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

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 *   * *** * *** * ******     *   *      * *****  
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 *  * ** **  **   * ** *****    **        ****     ***     ******     * **  *   ** * *   **** *
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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; 
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 *** ** **** ****** *  ***  len = strlen(a); 
      * ********   ****** ** ** = 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;
**** ***    ***   **   *     **     *  ***  *   %s",a,b);
 ** ** * *    * *   * **     len = strlen(a);
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*   ** ** *   ***** *  **** * ** ** *  **  ***  * 
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*** ***         *       *  *   * *  * ********  * *      * * ****** ** *  ** **  **  * * *  *  is not a prefix of %s",a,b);
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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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