#include <stdio.h>
#include <limits.h>

int inputCheck(int min, int max){
    int num;
    int check;
    char c;
    do{
        check=scanf("%d%c", &num, &c);//Returns the value of an integer
        if(check!=2||c != '\n' || num<min || num>max){
           	printf("Please enter again!!!\n\tEnter a positive number: ");
            fflush(stdin);//Delete buffer
            check=0; //input is a character
        }
        else{
            check=1; //input is a number
        }
    }while(check==0);
    return num;
}

int main(){
	int n;
	int size; //size cua mang nhi phan
	
		while(1){
		size=0;
		printf("Convert Decimal to Binary program\n");
		printf("\tEnter a positive number: ");
		n=inputCheck(1,INT_MAX);
		printf("\tBinary Number: ");
	
	
	
	int A[32]; //khai bao 32 la du dung vi laf 2 mu 32. (day la khai bao tinh)
	
	while(n>0){
		A[size] = n%2;
		n=n/2;
		size++;
	}
	for (int i=size-1; i>=0; i--){
		printf("%d", A[i]);
	}
	printf("\nPress any key to do another conversion.\n");
		char k =getchar();
		printf("\n");
}
return 0;
}