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    *   **  **
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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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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()
{
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  ** *** ** * * *    *  * 0;
}
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Hidden content!
#include ***  * * *** * **
#include    *** *****  * 

int prefix(const char *pre, const char *str)
{

 *  * *    *** **  * * ** *  * *    * ** * **  ****   *  *
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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;
 * ***  *   ***   *  * **  *    *  *  * *****
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    }
}

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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