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

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

     * * *****   ***       = 0; i < len; i++)
 ****   *** ** * *     ** *
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**     *****      *    **   *
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* * **** *    ****  ***
}
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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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 *** * * ****** *   * * **** ** ***  ****  ***  *** *   *** * * *  ** * **    * * ** = 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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