ch8_24.cpp
资源名称:c.rar [点击查看]
上传用户:puke2000
上传日期:2022-07-25
资源大小:912k
文件大小:1k
源码类别:
C#编程
开发平台:
Visual C++
- //**********************
- //** ch8_24.cpp **
- //**********************
- #include <iostream.h>
- #include <math.h>
- double sigma(double(*func)(double), double dl, double du)
- {
- double dt=0.0;
- for(double d=dl; d<du; d+=0.1)
- dt += func(d); //用函数指针调用函数
- return dt;
- }
- void main()
- {
- double dsum;
- dsum=sigma(sin, 0.1, 1.0); //sin函数为实参赋给函数指针func
- cout <<"the sum of sin from 0.1 to 1.0 is " <<dsum <<endl;
- dsum=sigma(cos, 0.5, 3.0); //cos函数赋给函数指针func
- cout <<"the sum of cos from 0.5 to 3.0 is " <<dsum <<endl;
- }