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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}

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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    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;

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

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

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  *   * **** *****   ** * * *   = 0; i < len; i++)
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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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*** *   *** *  **  *    *        *    * * ***    
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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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 ***  *     *  ***  **   ***** ***   ****  **** * ******  *
 * ***   * * ** * *** **** ** **  *** ** * ** **** *  **  **   ** **   **  *  * **    * **  *      * = 0;
* ***  **  * ***  ******   *** *   **   ***** *  ****  **** ** ** ** **  * **  ****** **** *   is not a prefix of %s",a,b);
**  *******   ***     **** *  * ********* *     *** **     **  ***  ** **  * * *** *  
 * *  ******* ** ****  * **      ***  *  **  * **

*  * *  *****  * * *** * *  
** *   * **  ** ** *  *   ***** *    == 1)
*   **      *   ***       * * *  *    **     * * *       * **  ***   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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