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

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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++) 
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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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