main1.cpp

这是本科铁道方向课程设计的一个简单的计算程序

#include <iostream>

using std::cout;
using std::endl;

#include <cmath>


int main()
{
	//初始变量数据设置 基本单位统一为毫米( mm )
	float f_op = 3;
	float f_oe = 3;
	float f_oe_1 = f_oe;
	float f   = 2.0;
	float i_y  = 5.24 * pow(10.0,6);    //单位 mm^4
	float beita = 2.0;
	float Q     = 8.4;				//单位 N/mm
	float R     = 6 * pow(10.0,5);
    float E		= 2.1 * pow(10.0,5);
	float L_0	= 4000.0;
	float pi	= 3.1415926;
	float L_2	= 0; //L的平方
	float L		= 0;
	

	float A = beita * E * i_y * pow(pi,2);	
	float B = ( 1/R + 8 * f_op / pow(L_0,2) );
	float C = 0;

	int i= 0;//计算循环次数
	
	while(1)
	{
		
		C = sqrt( pow(A*B,2) + ( A * pow(pi,3)/4 ) * ( f + f_oe ) * Q );
		L_2 = (A * B + C)/Q;
        L = sqrt(L_2);

		i++;
		if( abs( L - L_0 ) >= 10 )   //此处系数 9或10
		{
			//cout <<L<<endl;
			L_0 = L;
			f_oe = L_2 * f_oe_1/pow(4000.0,2);
	//		cout<<f_oe<< endl;
		}
		else
		{
			cout << "L= " << L << endl;
			cout << "f_oe= " << f_oe << endl;
			cout << "计算进行次数: "<< i;
			break;
		}
		//f_oe = pow(L,2) * f_oe/4000;
		//cout << A << endl << C << endl << L;
		//break;
		
	}

    getchar();
	return 0;
}