Calling out a code inside an if statement : I wanted to let the if statement perform the code inside it but it doesn't seem to do it at all, any idea on how I could let it perform the code inside?

	switch(act){
	case 1:
	cout<<"Here are the list of activities in this section." <<endl;
	cout<<"[1.1]Conversion of Celsius to Farenheit" << endl;
	cout<<"[1.2]Conversion of Farenhrit to Celsius:" << endl;
	cout<<"[1.3]Solving the area of the square" << endl;
	cin >> choice;
	
	system("CLS");
		if(choice == 1 || choice == 1.5){
			cout << "Celsius to Fahrenheit" ;
			cin >> F ;
			F = F*9/5+32;
			cout << F ;
					}
	
		break;
		