Declaring variables outside loop/IF structures in C

Question

I\'m new to the C language, rather programming overall. I was wondering why is it that when I declare a variable to be used within an if statement OUTSIDE the structure, that th

Answer 1

Maybe you are trying to eliminate the duplicate code. Since the difference between the if blocks is the tax rate, you could set the rate and at the end make one calculation.

#include
void grossPay();

int main()
{
    grossPay();
}

void grossPay()
{
    int rate = 10, hours;
    double tax, grosspay, netpay;

    printf("Enter work hours this week: ");
    scanf("%d", &hours);

    grosspay = hours * rate;

    if (grosspay <= 300 && grosspay > 0)
    {
        tax = 0.10;
    }
    else if (grosspay > 300 && grosspay <=1000)
    {
        tax = 0.15;
    }
    else if (grosspay > 1000)
    {
        tax = 0.25;
    }
    else
    {
        printf("Invalid input. Please try again.\n\n");
        return;
    }
    netpay = grosspay - grosspay * tax;
    printf("Pay for %d hours of week with $%d per hour\n", hours, rate);
    printf("Gross pay: $%.2f\n", grosspay);
    printf("Net pay: $%.2f\n", netpay);
}