Question

写一个用矩形法求定积分的通用函数,分别求正弦,余弦和自然对数幂函数的定积分.

Answer 1

#include

#include

double fun1(double x)

{

return sin(x);

}

double fun2(double x)

{

return cos(x);

}

double fun3(double x)

{

return exp(x);

}

double integral(double a,double b,double (*p)(double))

{

double step=(b-a)/10000;

double x,sum=0;

for(x=a;x