Question: Output two digits after decimal separator

Question

Using fprintf, what is the format-string to output two digits after a decimal separator?

float number = 3.0;
fprintf(pFile, "%10.02f", number); 

This always outputs 3 instead of 3.00

How do I fill up the digits after decimal separator with zeros? I want 3.00 written in the output file.

Answer 1

Use %.2f as your format specifier instead, or if you want 10 spaces first %10.2f

Answer 2

I suspect you want to represent currency amounts. Please don't use floats for this purpose. Decimal numbers aren't represented exactly with floats, this can lead to roundoff errors you don't want.