What are built-in functions and what variables naming rules?

1. 1. BUILTIN
FUNCTIONS
2. NAMING
VARIABLES RULE

2. 1. Nigah shah 0042
2. M. Jahangir Razaq 0138
3. M. Nabeel 0128
4. Habib Ur Rehman 0139

3.  These are functions that come with your
C++ compiler.
 The pre defined functions in the library
files of C++ e.g. <stdio.h>
 Have been written and tested to do some
common tasks.
 Common examples are;
I. The functions to take the square root of
a number sqr() .
II. To raise a number to a power pow()

4. #include<iostream>
#include<conio.h>
using namespace std;
void main()
{
float numbr = (float) 36;
float answr = (float) 0.0;
answr = sqr(numbr);
cout << “The Answer is: “ << answr;
}

5. i. All variable names must begin with a
letter of the alphabet or an underscore(
_ ) e.g. Grade.
ii. After the first initial letter, variable
names can also contain letters and
numbers. No spaces or special
characters, however, are allowed e.g.
GradeTest#1 is not allowed.

6. iii.The names of variables and data members are
all lowercase e.g. int .
iv. NEVER use uppercase for every letter in a
variable name, because uppercase names are
reserved for constant variables.