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[]){
 *  *** ** *** *  ***** * **   len=0, i, cnt=0;
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}

int main(void) {
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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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** * **** *      ** *** ****  prefix = 1;

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

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

* *    **  **   * * *** 
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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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