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I know its simple code, How do I fix "System not declared in scope" problem? #include<iostream> using namespace std; int main(void) { system ( "TITLE Calculator" ); system ( "COLOR 2" ); char cChar; double dfirstnumber; double dsecondnumber; char cDoagain; do { system("CLS"); cout << "Please enter the first number you would like to use."<< endl; cin >> dfirstnumber; cout<< "Please enter the operation you would like to perform." << " (+,-,*,or /)" << endl; cin >> cChar; cout<< "Please enter the second number you would like to use." << endl; cin >> dsecondnumber; switch (cChar) { case '+': cout << "The answer is: " << dfirstnumber << "+" << dsecondnumber << "=" << (dfirstnumber + dsecondnumber) << endl; break; case '-': cout << "The answer is: " << dfirstnumber << "-" << dsecondnumber << "=" << (dfirstnumber - dsecondnumber) << endl; break; case '*': cout << "The answer is: " << dfirstnumber << "*" << dsecondnumber << "=" << (dfirstnumber * dsecondnumber) << endl; break; case 'x': cout << "The answer is: " << dfirstnumber << "x" << dsecondnumber << "=" << (dfirstnumber * dsecondnumber) << endl; break; case 'X': cout << "The answer is: " << dfirstnumber << "X" << dsecondnumber << "=" << (dfirstnumber * dsecondnumber) << endl; break; case '/': if(dsecond

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