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Floating Point Issues - Programming

Q1:

What will be the output of the program? 
#include<stdio.h>
#include<math.h>
int main()
{
    printf("%f\n", sqrt(36.0));
    return 0;
}

A 6.0

B 6

C 6.000000

D Error: Prototype sqrt() not found.

ANS:C - 6.000000

printf("%f\n", sqrt(36.0)); It prints the square root of 36 in the float format(i.e 6.000000). Declaration Syntax: double sqrt(double x) calculates and return the positive square root of the given number.