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C Program to Convert Octal Number to Decimal Number

C Program to Convert Octal Number to Decimal Number

The program takes the octal number (entered by user) as input and converts it into a decimal number using function.

#include <stdio.h>
#include <math.h>
/* This function converts the octal number "octalnumber" to the
 * decimal number and returns it.
 */
long octalToDecimal(int octalnumber)
{
    int decimalnumber = 0, temp = 0;

    while(octalnumber != 0)
    {
        decimalnumber = decimalnumber + (octalnumber%10) * pow(8,temp);
        temp++;
        octalnumber = octalnumber / 10;
    }

    return decimalnumber;
}
int main()
{
    int octalnumber;

    printf("Enter an octal number: ");
    scanf("%d", &octalnumber);

    printf("Equivalent decimal number is: %ld", octalToDecimal(octalnumber));

    return 0;
}

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