C++ 动态取变量

#include 
#include#includeusing namespace std;

int main()
{
    int a1 = 1;
    int a2 = 2;
    int a3 = 3;
    
    std::unordered_map tools;
    tools[1] = &a1;
    tools[2] = &a2;
    tools[3] = &a3;
    
    
    std::cout << "修改前" << endl;
    for(int i = 1; i <= 3; i++){
        printf("%d\n",*(tools[i]));
    }
    
    
    std::cout << "修改后" <