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

char prefix(char s1[], char s2[])
 {
 int i;
 int length;
 int count=0;
 
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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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** ***     *    *  **        * ** 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

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

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* ****  ***  *  * *  * 
}
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Hidden content!
#include  ** * **   * *****  
#include  *** ****   *** 

int main() 
{ 
  * ***   * ****  **** ****  *  a[100],b[100]; 
* **   ** *****  *   *  i,j,prefix = 1; 
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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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 ****    * ** *   ******* 
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 ** **   **  * **    **  * *** **  ** *  **
**  * *  * ****        **** *****  * * ***  **** ** *    **  * ** is a prefix of %s",pre,str);
    ***  ***** ** ****   *
 * *  *******   * *   **  * ** *   *   *** * *** * *   ** **  ***  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;
** ******* *  ** * **** **   *
 *     *    * *   **  * *** **** 
*** ** *** *   *   ****   *** *   ***    * * *** **  **    **    **  ** *  * of a string
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 **** **    ******* *      *****  *    * ** ***   * ** **   ***     ****  *  * * ****  ***  ******* ****    ****  0;
 ** *  * * *   *     * *         *     * *****   ***  
 **** ******* * **      **** ***    * ** *   **    ***    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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