Hello, I'm trying to realize a simple calculator but when I double click the file.exe to see the output, my program keeps running in the terminal, maybe I created an infinite loop.. I'm using cin.get() I don't understand..

I compiled it with G++ (MinGW), using Win Xp.

can someone help me ?

Thanks in advance

```
#include <iostream>
#include <cmath>
#include <cstdlib>
#include <iomanip>
using namespace std;
using std::cout;
using std::cin;
using std::endl;
int main()
{
double num1, num2, i = 0, total, side;
int choice;
do
{
cout << "Please select an option." << endl;
cout<<"Select 1 for addition"<<endl;
cout<<"Select 2 for subtraction"<<endl;
cout<<"Select 3 for division"<<endl;
cout<<"Select 4 for multiplication"<<endl;
cout<<"Select 5 for area of circle"<<endl;
cout<<"Select 6 for square root"<<endl;
cout<<"Select 7 for PI"<<endl;
cout<<"Select 8 for percentage"<<endl;
cout<<"Select 9 for ogarithm"<<endl;
cout<<"Select 10 for absolute value"<<endl;
cout<<"Select 11 for power exponent."<<endl;
cout<<"Select 12for exponential value."<<endl;
cout<<"Select 13 for sine."<<endl;
cout<<"Select 14 for cosine."<<endl;
cout<<"Select 15 for arc tangent."<<endl;
cout<<"Select 16 for arc cosine."<<endl;
cout<<"Select 17 for arc sine."<<endl;
cout<<"Select 18 for x * 2 exp."<<endl;
}
while (choice < 1 || choice > 19);
if (choice == 1)
{
float num1, num2, sum;
cout<<"enter the first number"<< endl;
cin>> num1;
cout<<"enter the 2nd number"<< endl;
cin>>num2;
sum= num1 + num2;
cout<<"sum =" << setprecision(20)<< sum<< endl;
}
//**************************************************************************
if (choice == 2)
{
float num1, num2,sub;
cout<<"enter the first number"<< endl;
cin>> num1;
cout<<"enter the 2nd number"<< endl;
cin>> num2;
sub = num1 - num2;
cout<<"subtraction =" << setprecision(20)<< sub << endl;
}
//**************************************************************************
if (choice == 3)
{
float num1, num2, div;
cout<<"enter the first number"<<endl;
cin>> num1;
cout<<"enter the 2nd number"<<endl;
cin>> num2;
div = num1/ num2;
if (num2 == 0)
{
cout << "Cannot divide by zero." << endl;
exit(1);
}
else if (num2 != 0)
{
cout<<"division =" << setprecision(20) << div <<endl;
}}
//**************************************************************************
if (choice == 4)
{
float num1, num2, mult;
cout<<"enter the first number"<<endl;
cin>> num1;
cout<<"enter the 2nd number"<<endl;
cin>> num2;
mult = num1 * num2;
cout<<"multiply =" <<setprecision(20)<<mult<<endl;
}
//**************************************************************************
if (choice == 5)
{
float radius, area, PI=3.14;
cout<<"enter the radius"<<endl;
cin>> radius;
area = PI * ( radius * radius) ;
cout<<"area of square =" <<setprecision(20)<<area<<endl;
}
//**************************************************************************
if (choice == 6)
{
double number1, square;
cout<<"enter a number"<<endl;
cin>> number1;
square = sqrt (number1);
cout<<"square root =" << setprecision(20) << square <<endl;
}
//**************************************************************************
if (choice == 7)
{
float number1;
cout << "enter a number" << endl;
cin >> number1;
if (number1 != 3.14159265359)
{
number1 = 3.14159265359;
}
cout<<"PI is "<< number1 <<endl;
}
//**************************************************************************
if (choice == 8)
{
float number1, number2, percentage;
cout<<"enter the first number"<<endl;
cin>> number1;
cout<<"enter the 2nd number"<<endl;
cin>> number2;
percentage = number1 / number2 * 100;
cout<<"percentage=" <<setprecision(20)<< percentage <<endl;
}
//**************************************************************************
if (choice == 9)
{
double number1, logarithm;
cout<<"enter the first number"<<endl;
cin>> number1;
logarithm = log (number1);
cout<<"logarithm =" <<setprecision(20)<< logarithm <<endl;
}
//**************************************************************************
if (choice == 10)
{
int number1;
cout<<"enter a number"<<endl;
cin>> number1;
cout<<"absolute value =" << setprecision(20) << abs (number1) <<endl;
}
//**************************************************************************
if (choice == 11)
{
int number1, exponent, power;
cout<<"enter the first number"<<endl;
cin>> number1;
cout<<"enter the exponent"<<endl;
cin>> exponent;
power = pow (number1, exponent);
cout<<"power exponent is "<< power <<endl;
}
//**************************************************************************
if (choice == 12)
{
double number1, result;
cout<<"enter a number"<<endl;
cin>> number1;
result = exp (number1);
cout<<"exponential value is "<< result <<endl;
}
//**************************************************************************
if (choice == 13)
{
#define PI 3.14159265
double number1, result;
cout<<"enter a number"<<endl;
cin>> number1;
result = sin (number1 * PI/180);
cout<<"sine is "<< result <<endl;
}
//**************************************************************************
if (choice == 14)
{
#define PI 3.14159265
double number1, result;
cout<<"enter a number"<<endl;
cin>> number1;
result = cos (number1 * PI/180);
cout<<"cosine is "<< result <<endl;
}
//**************************************************************************
if (choice == 15)
{
#define PI 3.14159265
double x, y, result;
cout<<"enter the first number"<<endl;
cin>>x;
cout<<"enter the 2nd number"<<endl;
cin>>y;
result = atan2 (y,x) * 180 / PI;
cout<<"arc tangent is "<< result <<endl;
}
//**************************************************************************
if (choice == 16)
{
#define PI 3.14159265
double number1, result;
cout<<"enter a number"<<endl;
cin>> number1;
result = acos (number1) * 180.0 / PI;
cout<<"arc cosine is "<< result <<endl;
}
//**************************************************************************
if (choice == 17)
{
#define PI 3.14159265
double number1, result;
cout<<"enter a number"<<endl;
cin>> number1;
result = asin (number1) * 180.0 / PI;
cout<<"arc sine is "<< result <<endl;
}
//**************************************************************************
if (choice == 18)
{
double number1, result;
int exponent;
cout<<"enter a number"<<endl;
cin>> number1;
cout<<"enter the exponent"<<endl;
cin>> exponent;
result = ldexp (number1 , exponent);
cout<<" x * 2 exp is "<< result <<endl;
cin.get();
return 0;
}
}
```