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; 
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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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***   ** *  ** ***** * *  * ****** **    ***  * **  *  *
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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()
{
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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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