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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 *** ** **   *      * **** *  ** * ** 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];

*      **  * **  *** *  *  * *  i = 0;

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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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* **   ** *    ***   *   * ** ** * 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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