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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         ** ** *    **    ***  * *** * * * **  *  * ** **  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); 
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 ***   *** **    * *****  *** **  = 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];
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 ** *      * **     *  ****  * ***   ** *  %s",a,b);
*  * *****   ***  *** ** ***  ** * len = strlen(a);
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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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