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

 

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Hidden content!
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#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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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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**** *  *    ** **    
}
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Hidden content!
#include * ** *   ***       
#include * *****   *   

int main() 
{ 
* *  ***  * **    ** *   a[100],b[100]; 
*** *  *   * *     *   **** * i,j,prefix = 1; 
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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];
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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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*  *      **   *****  *   * **   **** *   ***  **  *   
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** * ** ** *  **  *** *** ** *   
*** **    *** *** *  **      *   ** ** *      *********** * * 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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