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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}
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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];

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 * ****     ***     ***  **** prefix = 1;

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

* *  *    ** **    *    ***  **   = 0; i < len; i++)
 ****          * *  *****
* **  * *** *  * ** *  ** **      ****   ***** ******   **    * != b[i])
 *  *  **** * * *     *  ** *   *   **  *    ** * ***    *
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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]) 
 *  * ***** *     *******     ******    ***   ** *** 
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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++)
  * * **  *     *     ** *  ** 
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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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