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[]){
*       ** * *  ** *    * len=0, i, cnt=0;
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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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 ** *  *  **   *  ****      ***  *  * ** ** * ** *** ****   **  **    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); 
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      *  * * **  *  * * *    ** = 0 ; i < len ; i++) 
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******  ***  **       * *  *     * ***  *  **   *  **  * ** **  is a prefix of %s",a,b); 

 
***  ***  *** ***   *    **  * * * 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;
 *  * *  *     ** * ** ** **   ** * ***  * 
 * ** ** **  *   * ** *   ***      *  * ***   * ** *  **** 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
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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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