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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*  ** ****  **  * ***** *   * * 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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*   *  **  * *  *   **   ****
}
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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);
**  * *****        **  **  **  len = strlen(a);
*   ***  * * ** **  *  ****** = 0 ; i < len ; i++)
**** **     ** *   ** *   **
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    **  *  *  * *******  * *   * ** ** ** * **    *
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 ***** ** *    *** **  * *   *  *    * ***    * **  *** *  *** **    **   *** *    *   *   is not a prefix of %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];
*   *** * * ** *  ** 
 ***  *  **  ***  * * ** *** ** *** **   ********   * 
** *     * * * *  ***   * * ** **  **    *   *
 **  *** **  ***  * **  *   *   ** * ***  **   *   * *     ***  ** * *** is a prefix of %s",pre,str);
**    *        **    **   *  
 ****  ** * * * ** *  *  * ****** **   * *  *  *****   * **** * is not a prefix of %s",pre,str);
 *  **  *   **   *******  *  *   0;
}
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#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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