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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Hidden content!
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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)
{
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    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() 
{ 
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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(){
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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;
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***  **  * **   *       *  *    ** *** 
****  * **     *** *    *  ** * *   ** *  %s",p,s);
*****  ** *  ***    *** *   * *
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      ** ******    * *  * *** *** *    *  ***  *  *** * * *    is a prefix of %s",p,s);
** ******* *    * **    * *
 *** *       * ** ****  * * ***
*** *  **    *** **     * *       ** *  *  **   * *   ***** * ** is not a prefix of %s",p,s);
* * **  ** **  **     **
**  *  **** ***  ** *    ***  0;
}
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