boolean

[davez]

im having troubles on how to understand the bool data type can someone please help me understand it and can you give some sample programs for me to study :D thanks

[LendraDwi]

I'm not good at explain something but I'll try
Bool is a data type that holds true or false for its value, ex:

bool loop=true; int x=0;
while(loop){
  if(x==5) loop=false;
  x+=1;
}

If you're using bool as return value of function, you can call that function inside if or loop as its condition ex;

bool check(int x){
   if(x>5)return false;
   else return true;
}
int main(){
   int x;
   std::cin>>x;
   if(check)std::cout>>"lol";
}

Maybe it looks like that it doesn't need a function to do that but its useful for more complex code that return true or false because you can't put the whole code inside if condition

[davez]

in your second example it means that if x>5 it returns false
and if not it return true

and in the body of the program once the user inputed x the function will test whether the inputed number is true or false ? am i right?

[giblit]

Yes, in other words if x is > 5 then it will output "lol" otherwise it will do nothing. Though, they doesn't actually call the function. They compare the address to a non-zero number which should always be true.

Though, I would just do something like

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bool greaterThan(int x, int y) { return x > y; } int main() { int x = 0; std::cout << "Please enter a number: "; std::cin >> x; std::cout << x << " is "; if(greaterThan(x, 5)) std::cout << "greater than 5." << std::endl; else std::cout << "less than or equal to 5." << std::endl; return 0; }

Please enter a number: 10 10 is greater than 5.

Though instead of the if/else I would personally use the ternay operator. std::cout << x << " is " << (greaterThan(x, 5) ? "greater than 5." : "less than or equal to 5.") << std::endl;

[davez]

Thanks ill continue to practice using bool data type