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Floating Point Issues - Programming

Q1:

Which statement will you add in the following program to work it correctly? 
#include<stdio.h>
int main()
{
    printf('%f\n', log(36.0));
    return 0;
}

A #include<conio.h>

B #include<math.h>

C #include<stdlib.h>

D #include<dos.h>

ANS:A - #include<conio.h>

math.h is a header file in the standard library of C programming language designed for basic mathematical operations. Declaration syntax: double log(double);