Answer to Question #27890 in C++ for faiz

Question

Question 2: Write a Simple Calculator Using If Else Statement that prompts the user to Input two Numbers. Then it will Display the Menu for Addition, Subtraction, Multiplication, Division, Square of 1st Number, Cube of 1st Number, Sin, Cos, Tan. After any choice it will Display the Answer

Answer 1

#include <iostream>
#include <math.h>

int main()
{
float x,y;

//Show messages to enter numbers
std::cout <<"Enter two numbers.\n";
std::cout <<"Enter first number x:\n";
std::cin >> x;
std::cout <<"Enter second number y:\n";
std::cin >> y;

int n;
do
{
//Show menu:
std::cout << "Choose option:\n";
std::cout << "1- Add (x+y)\n";
std::cout << "2- Subtract (x-y)\n";
std::cout << "3- Multiply (x*y)\n";
std::cout << "4- Divide (x/y)\n";
std::cout << "5- Square of x (x^2)\n";
std::cout << "6- Cube of x (x^3)\n";
std::cout << "7- Sin of x (sin(x))\n";
std::cout << "8- Cos of x (cos(x))\n";
std::cout << "9- Tan of x (tan(x))\n";
std::cout << "0 - exit\n";
std::cin >>n;
}
while ( ( n < 0 ) || ( n > 9 ) );

float result;
//calculate result according to input:
if ( n == 1 )
{
result = x+y;
}

if ( n == 2 )
{
result = x-y;
}

if ( n == 3 )
{
result = x*y;
}

if ( n == 4 )
{
if( y != 0 )
{
result = x/y;
}
else
{
std::cout << "Wrong division parameters ( y=0 )!\n";
return -1;
}
}

if ( n == 5 )
{
result = x*x;
}

if ( n == 6 )
{
result = x*x*x;
}

if ( n == 7 )
{
result = sin( x );
}

if ( n == 8 )
{
result = cos( x );
}

if ( n == 9 )
{
result = tan( x );
}

if ( n != 0 )
{
std::cout <<"Result=" <<result <<"\n";
}
return 0;
}


// other variant of calculator, using switch statement
#include <iostream>
#include <math.h>

int main()
{
float x,y;

//Show messages to enter numbers
std::cout <<"Enter two numbers.\n";
std::cout <<"Enter first number x:\n";
std::cin >> x;
std::cout <<"Enter second number y:\n";
std::cin >> y;

int n;
do
{
& //Show menu:
& std::cout << "Choose option:\n";
& std::cout << "1- Add (x+y)\n";
& std::cout << "2- Subtract (x-y)\n";
& std::cout << "3- Multiply (x*y)\n";
& std::cout << "4- Divide (x/y)\n";
& std::cout << "5- Square of x (x^2)\n";
& std::cout << "6- Cube of x (x^3)\n";
& std::cout << "7- Sin of x (sin(x))\n";
& std::cout << "8- Cos of x (cos(x))\n";
& std::cout << "9- Tan of x (tan(x))\n";
& std::cout << "0 - exit\n";
& std::cin >>n;
}
while ( ( n < 0 ) || ( n > 9 ) );

float result;
//calculate result according to input:

switch ( n )
{
case 1:
& result = x+y;
& break;
case 2:
& result = x-y;
& break;
case 3:
& result = x*y;
& break;
case 4:
& if( y != 0 )
& {
& result = x/y;
& }
& else
& {
& std::cout << "Wrong division parameters ( y=0 )!\n";&
& return -1;
& }
& break;
case 5:
& result = x*x;
& break;
case 6:
& result = x*x*x;
& break;
case 7:
& result = sin( x );
& break;
case 8:
& result = cos( x );
case 9:
& result = tan( x );
& break;
}

if ( n != 0 )
{
& std::cout <<"Result=" <<result <<"\n";
}
return 0;
}