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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}
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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];

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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); 
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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);
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******  ** *** ***  *  * ***   
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 * * *      * ** ******* *  **  **   * *****   ***  
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 *** * * * *   ***  *  *  *   * ***  ******   *** * ******  **** * ** **     * **** *  * * *  **** 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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