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;
 int length;
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}
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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()
{
 *  *** ****      ** **  * * * a[100];

  * **  * ****  *** ** ** * * b[100];

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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];
*      **  * **   *    *       i,j,prefix = 1;
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   *  ** * *     ******  ** 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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**   *** * *  ** * *** ******    *    
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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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*  ** * *****   *  **   
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* * ** ****  **** * ** ** ********** ** * *   *  
*  *******  *  *  *** * **  * *   ** ***   * **  **  *   *   **  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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