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); 
**** ***      ***  * ** * *   * 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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 ***  *    *   * **  *  * *** **  * *  == 1)
*       ***** *  ***  ** ***  ** ** **** *   * **  *   *** ** 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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