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#include <iostream>
#include <string>
#include <cmath>
double addition_function( double funcadd1, double funcadd2 );
double subtraction_function( double funcsub1, double funcsub2 );
double multiplication_function( double funcmul1, double funcmul2 );
double division_function( double funcdiv1, double funcdiv2 );
double root_function( double func_root_num, double func_root );
double power_function( double func_power_num, double func_power );
void introduction()
{
// Introduction.
// ...
std::cout << "Calculator.\n";
std::cout << "Input the number left of the type of operation.\n";
std::cout << "\n";
std::cout << "1. Addition.\n";
std::cout << "2. Subtraction.\n";
std::cout << "3. Multiplication.\n";
std::cout << "4. Divison.\n";
std::cout << "5. Find a root of a number.\n";
std::cout << "6. Raise a number to a power.\n";
}
int main()
{
double add1 = 0;
double add2 = 0;
double sub1 = 0;
double sub2 = 0;
double mul1 = 0;
double mul2 = 0;
double div1 = 0;
double div2 = 0;
double root_num = 0;
double root = 0;
double power_num = 0;
double power = 0;
std::string use_again = "y";
unsigned short int main_input = 0;
do
{
introduction();
std::cin >> main_input;
std::cin.ignore();
if ( main_input == 1 )
{
std::cout << "Addition:\n";
std::cout << "Input first number:\n";
std::cin >> add1;
std::cin.ignore();
std::cout << "Input second number:\n";
std::cin >> add2;
std::cin.ignore();
std::cout << add1 << " + " << add2 << " = " << addition_function( add1, add2 ) << ".\n";
}
else if ( main_input == 2 )
{
std::cout << "Subtraction:\n";
std::cout << "Input first number:\n";
std::cin >> sub1;
std::cin.ignore();
std::cout << "Input second number:\n";
std::cin >> sub2;
std::cin.ignore();
std::cout << sub1 << " - " << sub2 << " = " << subtraction_function( sub1, sub2 ) << ".\n";
}
else if ( main_input == 3 )
{
std::cout << "Multiplication:\n";
std::cout << "Input the first number:\n";
std::cin >> mul1;
std::cin.ignore();
std::cout << "Input the second number:\n";
std::cin >> mul2;
std::cin.ignore();
std::cout << mul1 << " * " << mul2 << " = " << multiplication_function( mul1, mul2 ) << ".\n";
}
else if ( main_input == 4 )
{
std::cout << "Division:\n";
std::cout << "Input first number:\n";
std::cin >> div1;
std::cin.ignore();
std::cout << "Input second number:\n";
std::cin >> div2;
std::cin.ignore();
std::cout << div1 << "/" << div2 << " = " << division_function( div1, div2 ) << ".\n";
}
else if ( main_input == 5 )
{
std::cout << "Find a root of a number:\n";
std::cout << "Input the number:\n";
std::cin >> root_num;
std::cin.ignore();
std::cout << "Input the root:\n";
std::cin >> root;
std::cin.ignore();
std::cout << root_function( root_num, root ) << ".\n";
}
else
{
std::cout << "Raise a number to a power.\n";
std::cout << "Input the number:\n";
std::cin >> power_num;
std::cin.ignore();
std::cout << "Input the power:\n";
std::cin >> power;
std::cin.ignore();
std::cout << power_num << "^" << power << " = " << power_function( power_num, power ) << ".";
}
main_input = 0;
add1 = 0;
add2 = 0;
sub1 = 0;
sub2 = 0;
mul1 = 0;
mul2 = 0;
div1 = 0;
div2 = 0;
root_num = 0;
root = 0;
power_num = 0;
power = 0;
std::cin.get();
}
while ( use_again == "y" );
return 0;
}
double addition_function( double funcadd1, double funcadd2 )
{
return funcadd1 + funcadd2;
}
double subtraction_function( double funcsub1, double funcsub2 )
{
return funcsub1 - funcsub2;
}
double multiplication_function( double funcmul1, double funcmul2 )
{
return funcmul1 * funcmul2;
}
double division_function( double funcdiv1, double funcdiv2 )
{
return funcdiv1/funcdiv2;
}
double root_function( double func_root_num, double func_root )
{
return pow ( func_root_num, 1/func_root );
}
double power_function( double func_power_num, double func_power )
{
return pow ( func_power_num, func_power );
}
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