C++ week2

#include<iostream>
using namespace std;
int main() {
    // 长100->a 宽30->b
    int a = 100, b = 30;
    // 周长，面积
    // (a+b) *2
    // ab
    int C = (a+b)*2;
    int S = a*b;
    cout << C << endl;
    cout << S << endl;
    return 0;
}

#include<iostream>
using namespace std;
int main() {
    // 上底 3 下底 6  高4.5
    int a = 3, b = 6;
    double h = 4.5;

    cout << (a+b)*h/2 << endl;
    return 0;
}

#include<iostream>
using namespace std;
int main() {
    // 头 -> head 腿->leg
    int head = 50, leg = 160;
    // 鸡
    int chicken = (4*head-leg) / 2;
    // 兔
    int rabbit = head - chicken;
    cout << chicken << " " << rabbit << endl;
    return 0;
}

#include<iostream>
using namespace std;
int main() {
    // 总数->n 车轮->wheel
    int n = 10, wheel = 26;
    // 自行车 -> b 三轮车 -> t
    int b, t;
    // 自行车
    b = 3*n-wheel;
    // 三轮车
    t = n - b;
    cout << b << " " << t << endl;
    return 0;
}