Do calculation in printf: float value

#include <stdio.h>

int main(void)
{
  printf("Number of seconds in a year: ");
  printf("%f", 60.0 * 60.0 * 24.0 * 365.0);

  return 0;
}

1.	Floating Point Input
2.	Computes the accuracy of the floating point numbers in storage and calculations
3.	Read user input: float
4.	Calculation: float
5.	Average the items in a 5 element array
6.	Use float as for loop control variable
7.	Print i and i/2 with fractions
8.	Work with int and float
9.	Output float
10.	Calculation between int and float
11.	Use scanf and printf to read and write float value in console
12.	Working with float
13.	Save calculation result into a float variable

Do calculation in printf: float value : Float « Data Type « C / ANSI-C