d4r07.cpp

来自「工程算法 这是一个很有用的工程数值算法集锦」· C++ 代码 · 共 40 行

#include <iostream.h>
#include <math.h>
#include <iomanip.h>
#include <stdlib.h>
#include <fstream.h>
#include <string>

void main()
{
    //program d4r7
    //driver for routine Gammq
    int i;
	char text[20];
    double w,z,value,nval; 
    const double pi = 3.1415926;
    fstream fin;
    fin.open("d:\\vc常用数值算法集\\data\\fncval.dat",ios::in);
    while (strcmp(text,"Incomplete")!=0)
	{
      fin>>text;
	}
	fin>>text;
	fin>>text;
    fin>>nval; 
    cout<<"Incomplete Gamma function"<<endl;
    fin>>text;
    cout<<endl;
    cout<<"     a          x          Actual         gammq(a,x)"<<endl;
    for( i = 1;i<=nval;i++)
	{
        fin>>w;
		fin>>z;
		fin>>value;           
		cout<<setw(7)<<w;
		cout<<setw(14)<<z;
		cout<<setw(14)<<(1-value);
		cout<<setw(16)<<gammq(w,z)<<endl;			         
    }
}