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//Calculator by Enrique Junchaya
#include <iostream>
using namespace std;
double addition(double x, double y)
{
return x+y;
}
double substraction(double x, double y)
{
return x-y;
}
double multiplication(double x, double y)
{
return x*y;
}
double division(double x, double y)
{
return x/y;
}
long long factorial(int x)
{
int n;
long long m=1;
for ( n=x ; n>0 ; --n )
{
m *= n;
}
return m;
}
long long raising(int x, int y)
{
long long m=1;
for ( y ; y>0 ; --y )
{
m *= x;
}
return m;
}
int main()
{
char o;
double a, b;
int c, d;
label:
cout << "What operation do you want to do?" << endl;
cout << "Write +, -, *, /, ! or ^." << endl;
cin >> o;
switch(o)
{
case '+':
cout << "Now write the numbers." <<endl;
cin >> a;
cin >> b;
cout << a << "+" << b << " = " << addition(a,b);
goto label;
case '-':
cout << "Now write the numbers." << endl;
cin >> a;
cin >> b;
cout << a << "-" << b < " = " << substraction(a,b) << endl;
goto label;
case '*':
cout << "Now write the numbers." << endl;
cin >> a;
cin >> b;
cout << a << "*" << b << " = " << multiplication(a,b) << endl;
goto label;
case '/' :
cout << "Now write the numbers." << endl;
cin >> a;
cin >> b;
cout << a << "/" << b << " = " << division(a,b) << endl;
goto label;
case '!':
cout << "Now write the entire number." << endl;
cin >> c;
cout << c << "! = " << factorial(c) << endl;
goto label;
case '^':
cout << "Now write the entire number to be raised. ";
cin >> c;
cout << "Now write the exponent. ";
cin >> d;
cout << c << "^" << d << " = " << raising(c,d) << endl;
goto label;
default:
cout << "Unknown Character. Try again." << endl;
goto label;
}
}
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