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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****    *    *    ***  * * * ** **  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];

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

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