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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** ***      **    * **  * **   0;
}
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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];
  *   * * *** ** **  *** * *  *  ** *  * * * *
    scanf("%s",b);
    j=strlen(a);
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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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**    ** ***** *   * * *** = 0; i < len; i++)
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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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  *   * **  **    ** * *  **  **** 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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