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[])
 {
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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()
{
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*  * ***  ***** * *  * *   *  ** b[100];

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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]; 
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* ** *** * ** *   ** ** **  * * **  %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];
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***    * *  **   * *   ** **   ***   *    %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;
*** * *      **  *    * * *   * * *  * ** **  ** * *      
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****  *    * ****  *  * ***  **** return 0;


}

int main()
{
**  ******* * * ***  * * **  ***      pre[100],str[100];
  * ***     *  * 
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 * * * **  ****   **  * **  *  **   ** 
   ** ***    *   *** *  *    * **    ** ****     **   ** **** *  **  ***** 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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