C++趣味编程：鸡兔同笼与票务计算

#include <iostream>
using namespace std;
int main() {
int a, b; 
for (a = 1; a <= 2; a++) { 
b = 3 - a; 
if (2*a + 4*b == 10) {
cout << "鸡：" << a << "只，兔：" << b << "只" << endl;
}
}
return 0;
}
#include<iostream>
using namespace std;
int main() {
// 成人票5元，儿童票3元，总金额40元
for (int cr = 1; cr <= 8; cr++) {  // cr = 成人(cheng ren)
int sy = 40 - 5 * cr;  // sy = 剩余(sheng yu)金额
if (sy > 0 && sy % 3 == 0) {
cout << cr << " " << sy / 3 << endl;  // 输出成人和儿童(er tong)人数
}
}

}