C++: Program for calculator using functions

#include<iostream>
using namespace std;
float sum(float, float);
float sub(float, float);
float mul(float, float);
float div(float, float);
int main()
{
float x, y, res;
char choice;
cout << "Calculator\n\n";
cout << "Enter two numbers\n";
cin >> x >> y;
cout <<
"Operations \n '+' for addition \n '-' for substraction \n '*' for multiplication \n '/' for division \n";
cin >> choice;
switch (choice)
{
case '+':
res = sum(x, y);
cout << "Sum is :" << res;
break;
case '-':
res = sub(x, y);
cout << "Substraction is:" << res;
break;
case '*':
res = mul(x, y);
cout << "Multiplication is:" << res;
break;
case '/':
res = div(x, y);
cout << "Division is :" << res;
break;
default:
cout << "Enter correct choice";
break;
}
return 0;
}
float sum(float a, float b)
{
return a + b;
}
float sub(float a, float b)
{
return a - b;
}
float mul(float a, float b)
{
return a * b;
}
float div(float a, float b)
{
return a / b;
}
              <Happy Coding>
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