mers/examples/03_Basic_Calculator.mers
2023-10-19 19:38:13 +02:00

31 lines
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"- Calculator -".println
"Type =<num> to set the value to that number.".println
"Type +<num>, -<num> or *<num> to change the value.".println
"Type exit to exit.".println
current := 0.0
{() -> {
("[ ", current, " ]").concat.println
input := ().read_line.trim
num := (
(input, 1).substring.trim.parse_float,
(
() -> 0.0,
val -> val
)
).try
mode := (input, 0, 1).substring
if (mode, "+").eq {
&current = (current, num).sum
} else if (mode, "-").eq {
&current = (current, (num, -1).product).sum
} else if (mode, "*").eq {
&current = (current, num).product
} else if (mode, "=").eq {
&current = num
} else if (input, "exit").eq {
(())
}
}}.loop