Thread: my program show inf. how???

Code:

this is my code:
#include <iostream>
#include <iomanip>
#include <cmath>


using namespace std;


int main()
{
    const double PI=3.142; 
    const double H=6.626E-34;
    const double C=2.998E+08;
    const double K=1.381E-23;
    
    char character;
    double i,u1,u2,u3,u4,u5,u6,u7,u8,p,temperature_in_Kelvin,surface_area_millimeter_square;
    int type_of_spectrum,lower_wavelength_range,upper_wavelenght_range;
    
    cout<<"Black body radiation "<<endl;
    cout<<"--------------------"<<endl;
    cout<<"\n\n";
        
    cout<<"Enter the type of radiation spectrum. "<<endl;
    cout<<"Visible light spectrum"<<setw(9)<< " =1"<<endl;
    cout<<"Ultraviolet spectrum"<<setw(11)<< " =2"<<endl;
    cout<<"Type of spectrum"<<setw(14)<<':';
    cin>>type_of_spectrum;
    cout<<"\n\n";
    
    while(type_of_spectrum<=0 || type_of_spectrum>2  )
    {    
        cout<<"YOU ENTER A INVALID CODE. PLEASE ENTER THE TYPE OF RADIATION SPECTRUM AGAIN."<<endl;
        cout<<"Visible light spectrum"<<setw(9)<< " =1"<<endl;
        cout<<"Ultraviolet spectrum"<<setw(11)<< " =2"<<endl;
        cout<<"Type of spectrum"<<setw(14)<<':';
        cin>>type_of_spectrum;
        cout<<"\n\n";
    }
    
    cout<<"Enter the lower limit and upper limit for the type of spectrum "<<type_of_spectrum<<" (nm)"<<endl;
    cout<<"Lower limit: ";
    cin>>lower_wavelength_range;
    cout<<"Upper limit: ";
    cin>>upper_wavelenght_range;
    cout<<"\n";
    
    if(type_of_spectrum==1)
    while (lower_wavelength_range<400 || upper_wavelenght_range>700 || lower_wavelength_range>upper_wavelenght_range) 
    {
        
        cout<<"The lower limit for visible light spectrum should be >=400."<<endl;
        cout<<"The upper limit for visible light spectrum should be <=700."<<endl;
        cout<<"Please enter the lower limit and upper limit again."<<endl;
        cout<<"Lower limit: ";
        cin>>lower_wavelength_range;
        cout<<"Upper limit: ";
        cin>>upper_wavelenght_range;
        cout<<"\n";
        
    }
    
    
    if(type_of_spectrum==2)
    while (lower_wavelength_range<10 || upper_wavelenght_range>400 || lower_wavelength_range>upper_wavelenght_range) 
    {
        cout<<"The lower limit for ultraviolet spectrum should be >=10."<<endl;
        cout<<"The upper limit for ultraviolet spectrum should be <=400."<<endl;
        cout<<"Please enter the lower limit and upper limit again."<<endl;
        cout<<"Lower limit: ";
        cin>>lower_wavelength_range;
        cout<<"Upper limit: ";
        cin>>upper_wavelenght_range;
        cout<<"\n";    
        
    }
    
    cout<<"Enter the temperature in (K): ";
    cin>>temperature_in_Kelvin;
    cout<<"Enter the radiating surface area in (mm): ";
    cin>>surface_area_millimeter_square;
    
    u1=((2*PI*H*C*C)/pow(lower_wavelength_range,5))*1/(exp((H*C)/lower_wavelength_range*K*temperature_in_Kelvin)-1);
    u2=((2*PI*H*C*C)/pow(upper_wavelenght_range,5))*1/(exp((H*C)/upper_wavelenght_range*K*temperature_in_Kelvin)-1);
    
    
    p=(u1*surface_area_millimeter_square*pow(10,-15))+(u2*surface_area_millimeter_square*pow(10,-15));
    cout<<fixed<<setprecision(5)<<u1<<endl;


    return 0;
}

I want to test the power with is p in my program, the expected output is 7.60161e-011 but my programme show inf