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

#define MIN_VALUE 0
#define MAX_VALUE 10000

int getInt(int, int);
int inputDecimalNumber();
long convertDecimalToBinary(int);
void outputBits(long binaryNum);

int main() {
    int decimalNum;
    long binaryNum;
    do {
        decimalNum = inputDecimalNumber();
        binaryNum = convertDecimalToBinary(decimalNum);
        outputBits(binaryNum);
    } while (1);
}

int getInt(int minValue, int maxValue) {
    int value;
    char check; //42a

    do {
        int rc = scanf("%d%c", &value, &check);
        fpurge(stdin);
        if (rc != 2 || check != '\n') {
            printf("Invalid value!\n");
        } else if (value > maxValue || value < minValue) {
            printf("Value out of range!\n");
        } else {// rc == 2 && check == '\n'
            return value;
            //break out of function
        }
    } while (1);
}

int inputDecimalNumber() {
    printf("\nConvert Decimal to Binary program\n");
    printf("\tEnter a positive number: ");
    int decimalNum = getInt(MIN_VALUE, MAX_VALUE);
    return decimalNum;
}

long convertDecimalToBinary(int decimalNum) {
    long bit, i = 1, binaryNum = 0;
    do {
        bit = decimalNum % 2;
        binaryNum += (i * bit);
        decimalNum /= 2;
        i *= 10;
                //check process
//               printf("%ld----%ld-----%d----%ld\n", bit, i, decimalNum, binaryNum);
    } while (decimalNum > 0);
    return binaryNum;
}

void outputBits(long binaryNum) {
    printf("\tBinary number: %ld\n", binaryNum);
    printf("Press any key to do another conversion.\n");
}