function centuryFromYear(num) {
    //  write code here.
    //Get the last two digits.
    //If they're 00 then the century is whatever the first digits are
    //Otherwise the century is the first digits + 1
    const year = parseInt(num.toString().substr(-2));
    const century = parseInt(num.toString().substr(0, num.toString().length-2));
    return year === 00 ? century : century + 1;
}



/**
* Test Suite 
*/
describe('centuryFromYear()', () => {
    it('returns current century', () => {
        // arrange
        const year = 1905;
        
        // act
        const result = centuryFromYear(year);

        // log
        console.log("result 1: ", result);
        
        // assert
        expect(result).toBe(20);
    });
    
    it('returns current century for edge case of start of century', () => {
        // arrange
        const year = 1700;
        
        // act
        const result = centuryFromYear(year);

        // log
        console.log("result 2: ", result);
        
        // assert
        expect(result).toBe(17);
    });    
    
    it('returns current century for year before 1000', () => {
        // arrange
        const year = 969;
        
        // act
        const result = centuryFromYear(year);

        // log
        console.log("result 3: ", result);
        
        // assert
        expect(result).toBe(10);
    });    
});