#include<iostream> using namespace std; int gcd(int n1, int n2) { while (n2 != 0) { int temp = n1; n1= n2; n2 = temp % n2; } return n1; } int main() { int a, b, c; cin >> a >> b >> c; int gcd(int, int, int); int s = gcd(a, b, c); int t = a * b / s && int t = (b * c / s )&& int t = (a * c / s); cout << "gcd(" << a << "," << b << "," << c << ")=" << s << endl; cout << "lcm(" << a << "," << b << "," << c << ")=" << t << endl; }

这段代码有一些问题：

1. 在 main 函数中定义了一个 int gcd(int, int, int) 的函数指针，但是并没有使用它，而是直接调用了全局定义的 gcd 函数。这个函数指针定义应该删除。

2. 在计算 lcm（最小公倍数）的时候，使用了 && 连接了三个表达式，但是这是错误的，应该使用 * 连接。正确的表达式应该是：int t = (a * b / s) * (b * c / s) * (a * c / s);

下面是修改后的代码：

#include<iostream> 
using namespace std;          

int gcd(int n1, int n2) {         
    while (n2 != 0) {             
        int temp = n1;             
        n1= n2;             
        n2 = temp % n2;         
    }         
    return n1;     
}     

int main() {          
    int a, b, c;     
    cin >> a >> b >> c;     
    int s = gcd(gcd(a, b), c);     
    int t = (a * b / s) * (b * c / s) * (a * c / s);     
    cout << "gcd(" << a << "," << b << "," << c << ")=" << s << endl;     
    cout << "lcm(" << a << "," << b << "," << c << ")=" << t << endl; 
}