Why do we use float data type in C program for area of a circle? What is the mathematical equation for the area of a circle? What are the variables required?

I want to write a program in C language to display the current time in milliseconds. What should be the basic logic behind writing this code? Please reply asap.

I am writing a  program in C which need to calculate the square root of  a  given number. Is there any square root function available in C library. How to implement it ?

I have just started learning C language in computers. I am able to solve some easy problems but I have stuck at the problem of how to write a c program to convert fahrenheit to celsius. Does anyone kn

Hello, mentioned the various other solutions for  the c program to convert temperature from fahrenheit to Celsius and also brief for the same in detail as well with its examples too for the guidance