Launch Discount

Problem

Read an integer from input, apply a 20% discount, and print the result.

1. Launch discount, Comet 64

Solution 1

Calculate 20% of the original value. Subtract the 20% value from the original value. The result should be 80% of the original value.

reg = input;      // Read the original value.
int = reg * 0.2;  // Calculate 20% of original value.
reg = reg - int;  // Subtract 20% value from original value.
output = reg;     // Print the result.

Solution 2

A 20% discount is the same as 80% of the original value. We must multiply the original value by 0.8.

reg = 0.8;        // Percentage of original value.
int = input;      // Read original value.
int = int * reg;  // Value after discount.
output = int;     // Print the result.

Solution 3

A 20% discount is the same as 80% of the original value. We must multiply the original value by 0.8. No need for using the register reg to store the fraction 0.8. Simply multiply the input value by 0.8, store the result to a register, and print the content of the register. This solution is optimal, according to the game.

reg = input * 0.8;  // Multiply original value by 0.8.
output = reg;       // Print the result.