#include<stdio.h>
// custom power function because my math library isn't
// working right now!!
int poww(int base, int exponent) {
    int result = 1;
    for (int i = 0; i < exponent; ++i) {
        result *= base;
    }
    return result;
}

int main() {

    int octalNum, rem = 0, dec = 0, bit = 0;

    printf("enter an octal number: ");
    scanf("%d", &octalNum;);

    while(octalNum) {

        rem = octalNum % 10;
        dec = dec + rem * poww(8, bit);
        octalNum = octalNum / 10;
        bit++;
    }
    printf("the Decimal value is: %d\n", dec);

    printf("the Hexadecimal value is: %X\n", dec);



    return 0;
}