使用WIN-TC编写一个程序，实现数值积分。用复化梯形方法、复化Simpson方法、变步长梯形方法、变步长Simpson方法编程求解积分值。-Using WIN-TC to write a program to achieve numerical integration. Compound trapezoid method used, the complex method of Simpson, variable step trapezoidal method, Simpson variable step method for solving integral value programming.