说明：  其中一个是是变步长复化梯形公式例程，该程序是用变步长复化梯形公式计算定积分的C语言程序。另一个是1.1.2 变步长复化抛物线公式例程，该程序是用变步长复化抛物线公式计算定积分的C语言程序。
(One is the variable step size compound trapezoid formula routines, the program is the variable step size compound trapezoid formula to calculate definite integral C language program. The other is a1.1.2 variable step size composite parabola formula routines, the program is the variable step size composite parabola formula to calculate the definite integral of the C language program.)