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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int main(void)
{
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***   *    * **  *** * *        *  
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}
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Hidden content!
#include     ***     * *** 
#include  * *  **  * * *** 

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

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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]) 
*****  ** * **   **  **    **** ** ** * **  ** *** 
*  *  ** *   *  * **  ** **  *** * **** * **  * **    ** * * ** *       * * * * *** * = 0; 
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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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