如何将一个数从自身中减去多次？

Question

我试着让用户输入一个数字，然后再输入一个数字，告诉程序要做多少次基本的数学运算。我得到了工作的加法和乘法，但我不确定如何得到减法，以减去一个数字本身由用户选择的次数。

print "Please Enter a numeric value: ";  # get the first input from user

input1 = STDIN.gets.chomp!.to_i

puts ("\n" * 2)                           #Scroll the screen 3 times

print "Enter total number of times a value needs to be computed from #{input1} "; 

input2 = STDIN.gets.chomp!.to_i

puts ("\n" * 2) 

print "Addition : ", (input1.to_i * input2.to_i), "\n";       
print "Subtraction : " , (input1.to_i - input2.to_i), "\n";     
print "Multiplication : " , (input1.to_i ** input2.to_i), "\n";

Answer 1

怎么样：

print "Subtraction : " , input1.to_i-(input1.to_i*input2.to_i), "\n";