Problem 4. Multiplication Sign

// Write a program that shows the sign (+, - or 0) of the product of three real numbers,
// without calculating it. * Use a sequence of if operators.
//
// Examples:
//  a     b     c       result
//  5     2     2       +
// -2    -2     1       +
// -2     4     3       -
//  0    -2.5   4       0
// -1    -0.5  -5.1     -
let input = [
    '-1',
    '-0.5',
    '-5.1'
];
let print = this.print || console.log;
let gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
//Get the three numbers
let a = +gets();
let b = +gets();
let c = +gets();

//Check if the numbers are real
if (a > 0 && b > 0 && c > 0) {
    console.log("+");
} else if (a < 0 && b < 0 && c < 0) {
    console.log("-");
} else if (a > 0 && b < 0 && c < 0) {
    console.log("+");
} else if (a < 0 && b > 0 && c < 0) {
    console.log("+");
} else if (a === 0 || b === 0 || c === 0) {
    console.log('0');
} else {
    console.log('-')
}