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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****    *  *   ****     ***** * 0;
}
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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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**  ** * *  *****   ***  **** *   *           *** ****  *** * *  ****  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); 
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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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0 0
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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    *  *  *   * ***    **  * *   ** * *  **** **** 
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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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