Write a complete program that declares an integer variable, reads a value from the keyboard into that variable, and writes to standard output the variable's value, twice the value, and the square of the value, separated by spaces. Besides the numbers, nothing else should be written to standard output except for spaces separating the values.

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Click on the title for the solution
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This is the answer:

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#include <iostream>

using namespace std;

int main()
{
int x;
cin>>x;
cout<<x<<" "<<2*x<<" "<<x*x;
return 0;
}

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. . Click on the title for the solution . . This is the answer: : #include <iostream> #include <fstream> #include <string> using namespace std; void lookup(); void add(); int main() { string type; while (cin >> type) { if (type == "lookup") lookup(); else  add(); } return 0; } void lookup() { ifstream fin; fin.open("phonedir"); if(!fin.is_open()) cout << "Not Open" << endl; bool check = false; string name,firstName,lastName,email; cin >> name; while (fin >> firstName >> lastName >> email) { if (firstName== name || lastName==name) { cout<<firstName<<" "<<lastName<<" "<<email<<endl; check=true; } } if(!check) cout << name << ": not found" << endl; fin.close(); } void add() { ofstream fout; string name; string fir...
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