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Using exponent in C++ Visual Basic 2005 Express Edition?

Pretty straightforward, how can you use exponents in C++ visual Basic 2005 Express edition. The internet has conspired against me, and the textbooks we are using are for a outdated C++ version. It would be most appreciated for someone to show me how to do a simple function such as (3.0 * 10^8) and show me which library to use.

//
// Done in Visual C++ 2005Express Edition
//
#include <iostream>
#include <math.h>

void main()
{
double val = 0.0;

val = 3.0 * pow(10.0, 8.0);
std::cout << "3.0 * 10^8 = " << val << "\n";

val = pow(3.0, 8.0);
std::cout << "3.0 ^ 8.0 = " << val << "\n";
}


///// --- output --- ////

3.0 * 10^8 = 3e+008
3.0 ^ 8.0 = 6561

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