Question

I’m writing code that doesn’t use pow() in c++, but I am getting quite a few errors which I can’t figure out:

double power (double X, unsigned int N)
{
    double value;
    unsigned int i = 1;
    for (i = 1, i <= N, i++)
    {
        result = result * X;
    }

    if (finite(result))
    {
        return result;
    }
    else
    {
        return INFINITY;
    }
}

Errors:

In function 'double power(double, unsigned int)':
Line 5: warning: right-hand operand of comma has no effect
Line 5: error: expected ';' before ')' token
Line 10: error: expected primary-expression before 'if'
Line 10: error: expected ';' before 'if'
Line 10: error: expected primary-expression before 'if'
Line 10: error: expected ')' before 'if'

Any help would be appreciated, thanks.

Answer 1

It should be for (i = 1; i <= N; i++).

In C++, the semicolon is usd to delimit the different parts of the for loop.