import std.stdio,std.cstream;
void main(string[] args)
{
while (true)
{
writeln ("Calculator Menu");
writeln();
writeln();
writeln (" 1 - Add");
writeln (" 2 - Subtract");
writeln (" 3 - Multiply");
writeln (" 4 - Divide");
writeln (" 5 - EXIT");
writeln();
write ("Selected Number: ");
int operation;
readf (" %s", &operation);
if ((operation < 1) || (operation > 5))
{
writeln ("Invalid Operation");
readln();
readln();
continue;
}
if (operation == 5)
{
writeln ("Goodbye!!!");
readln();
readln();
break;
}
int first;
int second;
write ("First Number: ");
readf (" %s", &first);
write ("Second Number: ");
readf (" %s", &second);
int result;
if (operation == 1)
{
result = first + second;
}
else if (operation == 2)
{
result = first - second;
}
else if (operation == 3)
{
result = first * second;
}
else if (operation == 4)
{
result = first / second;
}
else
{
writeln ("There is an error!");
writeln ("This condition should never occurred.");
break;
}
writeln ("Result : ", result);
readln();
din.getc();
}
}--------------------------This is the code. where or what code will I use for clear the screen?
