js字符转换成分数

function charToFraction(char) {
    if (char >= '0' && char <= '9') {
        let num = parseInt(char);
        return { numerator: num, denominator: 1 };
    } else {
        throw new Error('Invalid input: not a single digit character');
    }
}

// 使用示例
console.log(charToFraction('5')); // 输出: { numerator: 5, denominator: 1 }

function romanToFraction(roman) {
    const romanValues = {
        'I': 1,
        'V': 5,
        'X': 10,
        'L': 50,
        'C': 100,
        'D': 500,
        'M': 1000
    };
    let total = 0;
    for (let i = 0; i < roman.length; i++) {
        if (i + 1 < roman.length && romanValues[roman[i]] < romanValues[roman[i + 1]]) {
            total -= romanValues[roman[i]];
        } else {
            total += romanValues[roman[i]];
        }
    }
    return { numerator: total, denominator: 1 };
}

// 使用示例
console.log(romanToFraction('XII')); // 输出: { numerator: 12, denominator: 1 }

function stringToFraction(str) {
    const parts = str.split('/');
    if (parts.length !== 2) {
        throw new Error('Invalid input: not a fraction string');
    }
    const numerator = parseInt(parts[0]);
    const denominator = parseInt(parts[1]);
    if (denominator === 0) {
        throw new Error('Invalid input: denominator cannot be zero');
    }
    return { numerator, denominator };
}

// 使用示例
console.log(stringToFraction('3/4')); // 输出: { numerator: 3, denominator: 4 }