用C语言写一个计算分数加减乘除的代码

好的，以下是用C语言写一个计算分数加减乘除的代码的示例：

#include <stdio.h>

typedef struct {
    int numerator;   // 分子
    int denominator; // 分母
} Fraction;

// 求最大公约数
int gcd(int a, int b) {
    if (b == 0) {
        return a;
    } else {
        return gcd(b, a % b);
    }
}

// 约分
void reduce(Fraction *f) {
    int g = gcd(f->numerator, f->denominator);
    f->numerator /= g;
    f->denominator /= g;
}

// 加法
Fraction add(Fraction f1, Fraction f2) {
    Fraction result;
    result.numerator = f1.numerator * f2.denominator + f2.numerator * f1.denominator;
    result.denominator = f1.denominator * f2.denominator;
    reduce(&result);
    return result;
}

// 减法
Fraction subtract(Fraction f1, Fraction f2) {
    Fraction result;
    result.numerator = f1.numerator * f2.denominator - f2.numerator * f1.denominator;
    result.denominator = f1.denominator * f2.denominator;
    reduce(&result);
    return result;
}

// 乘法
Fraction multiply(Fraction f1, Fraction f2) {
    Fraction result;
    result.numerator = f1.numerator * f2.numerator;
    result.denominator = f1.denominator * f2.denominator;
    reduce(&result);
    return result;
}

// 除法
Fraction divide(Fraction f1, Fraction f2) {
    Fraction result;
    result.numerator = f1.numerator * f2.denominator;
    result.denominator = f1.denominator * f2.numerator;
    reduce(&result);
    return result;
}

int main() {
    Fraction f1 = {2, 3};
    Fraction f2 = {3, 4};

    Fraction result = add(f1, f2);
    printf("%d/%d + %d/%d = %d/%d\n", f1.numerator, f1.denominator, f2.numerator, f2.denominator, result.numerator, result.denominator);

    result = subtract(f1, f2);
    printf("%d/%d - %d/%d = %d/%d\n", f1.numerator, f1.denominator, f2.numerator, f2.denominator, result.numerator, result.denominator);

    result = multiply(f1, f2);
    printf("%d/%d * %d/%d = %d/%d\n", f1.numerator, f1.denominator, f2.numerator, f2.denominator, result.numerator, result.denominator);

    result = divide(f1, f2);
    printf("%d/%d / %d/%d = %d/%d\n", f1.numerator, f1.denominator, f2.numerator, f2.denominator, result.numerator, result.denominator);

    return 0;
}

希望这个示例能够帮助你理解如何用C语言计算分数的加减乘除。