I need help 😭 I'm new to c++ and I'm stuck

Question

I try to print a floating point number, for example
double number = 1/2;
cout <<number ;//output is 0 instead of 0.5
Why does the compiler take the whole number and keeps out the decimals
But on the other hand,
double number = 0.5;// output is 0.5 I'm confused

I KNOW THIS IS MERE BASICS BUT PLS DON'T SKIP 🙏

Answer 1

FF9900 thanks for the help, it helped me solve my third challenge, ticket office in c++

Answer 2

#include <iostream>
using namespace std;

int main() {

float a=1.0/2.0;
cout<<"input one number "<<endl;
cout<<a; //Output=0.5

return 0;
}