Ruby program to subtract a number without using the minus (-) operator

subt=0
num1=0
num2=0

print "Enter number1: ";
num1 = gets.chomp.to_i;  

print "Enter number2: ";
num2 = gets.chomp.to_i;  

subt = num1 + (~num2) + 1;

print "Subtraction is: ",subt;

Output:

Enter number1: 8
Enter number2: 3
Subtraction is: 5