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;
 int count=0;
 
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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];
    ***   *  *  *    *  *  ************* * *** * 
    scanf("%s",b);
    j=strlen(a);
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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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* * ***       *  * * *  *  *  **** ******    * ** * *    **  *  *  **   is a prefix of %s", a, b);

*** * ***  **  *   ****   **   
}
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Hidden content!
#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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*   *   **  ** *    * **** *    * 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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 *** ****  * ** ******* **    * * ** ********  
 ****  *   * **  *  ** * **** * **** * ***  * *  **** * ** * *** ****   ****  ** *** = 0;
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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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