Calculator

equ.nim

from strutils import replace,find,parseInt

echo("Input an operation:")
var line = readLine(stdin)

line = replace(line, " ", "");

let 
    opindex = find(line, {'+','-','*','/'})
    op = line[opindex]
    arg1 = parseInt(line[0..opindex-1])
    arg2 = parseInt(line[opindex+1..high(line)])

var result: int = 0
case op
of '+':
    result = arg1 + arg2
of '-':
    result = arg1 - arg2
of '*':
    result = arg1 * arg2
of '/':
    result = (arg1 / arg2).int
else:
    discard

echo("Result = ", result)