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];
*   * ** ** *   **  *  *** *  ** ***   ** *    
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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];

** * *    *** ** *** * ***** i = 0;

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*** * *  ** *** ***   * *   ** * ** *** *** *  *  a, b);

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     *  *     * *  **  * *  * **  = 0; i < len; i++)
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 *     * *** ******  *  **   * ** ** *   * * **  * * **** * ***      * *  *  ** 
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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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***    *    * *   *  * * ***     ** * *   *****   ***         * 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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** *   *     **    *** ** ** * * **   * * **  *   **    *  * ** *  *  
 **** * **** ***    * *  *    **  * ** * ** *  **** *   **    * *** ***  *  * = 0;
 **  *      *  **  *   * **   **  ****  **     **** * **  *     * ** ***  * **     is not a prefix of %s",a,b);
 **      ***** *  *    *      * ****   **** * * **  *** * **** *** *  *  **   *** ** * 
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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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