Question

What format string in printf or iomanip operator in iostream should I use to print the float in the following format:

• 125.0 => 125
• 125.1 => 125.1
• 125.12312 => 125.12
• 1.12345 => 1.12
• 1234.1235 => 1234.12

In short, print at most 2 digits after the point, but remove all trailing zeros.

I tried %.2f but doesn’t work because it prints 125.00 and 125.10 for the first 2 cases.

Answer 1

Looks like I figured out some simple work around:

void print(float f) {
  f = floor(f * 100.0f + 0.5f) / 100.0f;
  cout << f;
}

would solve most common cases. One thing that can’t to solved is f > 10e7, which cout will print f in scientific notion.