Issue on page /part_one/03_simple_math.html

[esemsc-tb1524]

In the C++ implementation of forward Euler, n is not defined in the second for loop and it should be nsteps instead.

for (int i=1; i<=nsteps; i++) {
    t[i] = t[i-1] + h;
    y[i] = y[i-1] + h*f(y[i-1]);
}

for (int i=0; i<n; i++) {
    std::cout << t[i] << " " << y[i] << std::endl;
}