fix an error

[jananijeev]

DESCRIPTION OF ISSUE/FEATURE :
the variable Num3 is not declared ,only num2 is declared
WHY THIS ISSUE TO BE FIXED?
the sum will not generate if its not fixed ,the addition wont take place and will give error in the program
HOW TO REPRODUCE IN CASE OF BUG
must declare the variable num3
sum=num1+num3 (wrong)
sum=num1+num2(correct)
OTHER NOTES/ENVIRONMENT INFORMATION
windows os 11
java online compiler

[jananijeev]

@Haripriyasaran