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!
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#include **   *  *  * * *

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

int prefix (char st1[],char st2[]){
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*  ** * ****** * * ** * *   0;
}
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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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   **  ** **  ***  *** *      = 0; i < len; i++)
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 ** *  **    ***    ******
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  **   ****  ***   *  * ** * 
}
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Hidden content!
#include  *  **** **  ** 
#include  ********   * ** ** 

int main() 
{ 
  * *  *  * **** ********  a[100],b[100]; 
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**    **  *** ** ***  * ***  len = strlen(a); 
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            ****   ** ** *** 
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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);
 *  **  * **  *   * *** * * * len = strlen(a);
 * *  *   *   *    * ****** *   * = 0 ; i < len ; i++)
  **** * ** ** * * **** *
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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;
** *  ****  *  * *  ***** *  * **** ****  *  * 
* ** *    *        *** * ****   *****      * **      *   1;
**  *  *   * *  * * ** *         return 0;


}

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