Undefined variable 'num3' used ( in num.c file )

[Joel-V-Reji]

#description
In num.c, the sum is calculated as sum = num1 + num3;, but the variable num3 is not defined or initialized anywhere . This will result in a compilation error and undefined behavior.

#why it this issue must be fixed

It needs to be fixed to ensure program efficiency and remove compilation errors.

#Steps to Reproduce:

-Compile num.c.
-Observe the compilation error indicating 'num3' is undeclared.
-failed code execution

#Additional info

Fixing this will allow the program to compile and function as intended.