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!
#include  *  **  * **
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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() 
{ 
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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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 ** *****    ***  * *** *  * **   * * *  *         
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** *** ****   * ** ***** return 0;


}

int main()
{
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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;
*** ** ** *  *  *** **   ****  *   *    *  ** 
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    }
}

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