How to output an integer as a float number?

Question

In C++, if we initialize 2 float variables as 4.0 and 4.0 and find their sum (float variable), it output's 8 and not 8.0. Why so? N how to make the output 8.0?

Answer 1

use setprecision(n) manipulator, where n is decimal precision.

example
float f =3.14159;
cout <<setprecision(4) << f << '\n';
cout <<setprecision(9) << f << '\n';

Output:
3.1416
3.14159

Answer 2

Use float(sum) instead of sum at the time when you want to print.
cout << float(sum);
This is explicit type conversion.

Answer 3

1+2+3+5÷4.0