2.30

#include <iostream>using namespace std;int sroot(int x){return x*x;}long sroot(long y){return y*y;}double sroot(double z){return z*z;}int main(){ int x; long y; double z; cin>>x; cin>>y; cin>>z; cout<<x<<'*'<<x<<'='<<sroot(x)<<endl; cout<<y<<'*'<<y<<'='<<sroot(y)<<endl; cout<<z<<'*'<<z<<'='<<sroot(z)<<endl; return 0;}