Description

請撰寫一支程式，從 input.txt 讀取一個數字，然後寫入 Hello World! 到 output.txt。

Please write a program that reads a number from input.txt and then writes "Hello World!" to output.txt.

Input (From File: input.txt)

輸入包含一個整數。

Input contains an integer.

Output (To File: output.txt)

請寫入 Hello World! 到 output.txt。(不須換行)

Please write "Hello World!" to output.txt.(No need for a newline.)

Sample Input 1

32

Sample Output 1

Hello World!

#include<stdio.h>
#include<stdlib.h> 
#include<string.h>
#include<ctype.h>

int main(){

   int n = 1725;
   scanf("%d",&n);
   char f[10]={"\\0"};
   int radix=10;
//   itoa(n,f,radix);
//   apparently fcu oj doesnt have itoa

	sprintf(f, "%d", n);
   strcat(f,".txt");
   printf("%s",f);
   
   
   // nvm whats above is unnessasry i misunderstood the assignment
   FILE *fptr;
   
   fptr = fopen(f,"w");
   fprintf(fptr,"Hello World!");
   
   fclose(fptr);
	
	
	
	
	return 0;
	
}