Assume that day is an int variable whose value is 1 or 2 or ... or 7. Write an expression whose value is "sun" or "mon" or ... or "sat" based on the value of day. (So, if the value of day were 4 then the value of the expression would be "wed".).

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This is the answer:

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day==1 ? "sun" : (day==2 ? "mon" : (day==3 ? "tue" : (day==4 ? "wed" : (day==5 ? "thu" : (day==6 ? "fri" : (day==7 ? "sat" : "invalid"))))))

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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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