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 **    *  *  **
#include **   *   *  * *  

int prefix (char st1[],char st2[]){
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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()
{
*  *   *     *** * *  ***  ****  *  *  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)
{

* *  **  **  *  * ** *  *** **   *  **    *** *  *  *
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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;
* *    **** ****  * *     **     *   **   *  *   *
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 *****  ** **  ****** *  * **  **** *     ***    **
 ***  **** *  * *  **     ********* ****  **   * *  **  * 1;
    }
}

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