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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}
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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];
**  *   *    *** **    * *   ** i,j,prefix = 1;
***   * ** *      * *** * ** ***    **    %s",a,b);
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 * *****  ***  **** ***  *** **    * *    ****** *
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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;
     * *  ***   *  **   *   ** *** * * **    *   
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* ****** ***  *  ** *  ** ** return 0;


}

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