function sortGrade(data) {
    for (i = 0; i < data.length; i++) {
        for (j = 0; j < data.length; j++) {
            console.log(i+'번 데이터'+data[i])
            console.log(i+'번  '+data[i]['grade']+'    '+j+'번   '+data[j]['grade'])
            if (data[i]['grade'] < data[j]['grade']) {
                // console.log(data[i]['grade']+' < '+data[j]['grade'])
                let temp = data[i];
                data[i] = data[j];
                data[j] = temp;
            } else if (data[i]['grade'] === data[j]['grade'] && data[i]['credit'] > data[j]['credit']) {
                let temp = data[i];
                data[i] = data[j];
                data[j] = temp;
            }
        }
    }
    return data;
}

function print(data) {
    data = sortGrade(data);
    let output = "";
    output += `-----------------------------------------\n`
    for(i=0; i<data.length; i++){
        output += `${data[i]['name']}, ${data[i]['grade']}, ${data[i]['credit']}학점\n`
    }
    output += `-----------------------------------------`;
    return output;
}