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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include ***** * *****   *
#include ** ***** *    

char prefix(char s1[], char s2[])
 {
 int i;
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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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 ** *  * **       *  * * ***  *
}
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Hidden content!
#include * *    *** *** ** 
#include ** *  **  * *   * 

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


* **  ***    **  *   **   **  0;
}
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Hidden content!
#include     * *    * **
#include    ** * ****   

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

 ***   ***  *** **     ** *    * * *  **   *** 
**      ** ** ***   **  **** *  *         *****  *  **   * * 0;
*** *** **  *  ***  * **  ***   * * *    **  * **
  *    **** **** ***   ** * *       *   * **  ***    **  1;
  *** **  **   *     ** **  * *   return 0;


}

int main()
{
  **** *    *  *  * *** ******   * pre[100],str[100];
* *  *   *   *   
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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;
   **** ** * ** *  **   *  * **
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 *** *     * ** *   *    *  **** * * **     * ***  ***  **  *         **** **   ***  * * * ****
** *** **  *** * ** * *     ****  **  **    **        * *** * ***  ***  *  **** *    *  ** * **** ** *** *** ** *  0;
* * *  *  ** ******* **  *   ***  ********  ** ** **
 ** ***  *  ** ** ***** **  ** * * * *   ***   *   * ** 1;
    }
}

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