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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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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}
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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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}

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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 ***  *          ** * **   ** * ****    *  * * ** *  ***  ** ****  **  * * * *   of a string
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   * **  *     ***  ****** *  *  ** **** * *   *   *** *
** **   **  **** ** *** *** * *** * **  **   *     * *  **  1;
    }
}

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