C++ Program to Solve a Differential Equation by Euler's Method (Solution of Differential Equations by Initial Values)

C++ Program to Solve a Differential Equation by Euler's Method (Solution of Differential Equations by Initial Values) 
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dy/dx is denoted as f(x,y), x₀, y₀ is given or the initial values of x and y are given then we can calculate f(x,y) at these points and can calculate the next points,
x₁ = x₀+h (step size)
 y₁ = y₀+h*f(x₀,y₀)


x₂ = x₀+2*h
 y₂ = y₁+h*f(x₁,y₁)
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y_n+1 = y_n+h*f(x_n,y_n)