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

int prefix (char st1[],char st2[]){
  * * ** ***   ****  ***  len=0, i, cnt=0;
    **   * **** **  *     ** 
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}

int main(void) {
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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);
    for(i=0;i<j;i++)
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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;

  * **   ***** **    * * * *   *   prefix = 1;

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

*****   *   ******  *  **** *  len = strlen(a);

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

***  *  ******   ***** 
* * * **** * ** * ** **  ** == 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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