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!
#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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}
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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]; 
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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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*   *** * * **   ****    * * 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()
{
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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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 ***    *     ****  ** **** **   **** ** * ****** **
***   * *      * *    *****  *** ****    *      ****    *  *  * 1;
    }
}

int main(){
*   ** *** **    **  * ** a[100],b[100];
**    * *   **** ***  *  *** ** *** %s",a,b);
**    *****    **** * *   * *   **  
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*    **   *   *  **     *
******** ***  **    **  *****    ** ******   * * ***   * ** ** ** 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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