Floating Point

Floating Point

HolyC has one floating-point type: F64, a 64-bit double-precision float. This is equivalent to C's double.

Declaring Floats

F64 pi = 3.14159;
F64 e  = 2.71828;
F64 temperature = -17.5;

Arithmetic

Float arithmetic works exactly as in C. Integer literals are automatically promoted:

F64 x = 1.5;
F64 y = x * 2.0;   // 3.0
F64 z = x + 0.5;   // 2.0

Printing Floats

Use %f for standard decimal output, or %.Nf to control decimal places:

F64 pi = 3.14159;
Print("%f\n", pi);     // 3.141590
Print("%.2f\n", pi);  // 3.14
Print("%.4f\n", pi);  // 3.1416

Mixing Integers and Floats

You can assign an integer to a float variable; HolyC converts it automatically:

F64 half = 1.0 / 2.0;   // 0.5   (float division)
I64 whole = 1 / 2;      // 0     (integer division truncates)

Your Task

Compute the area of a circle with radius 7.0 using pi = 3.14159.

Formula: area = pi * r * r

Print the result with 2 decimal places: 153.94