How do I assign to the input a value x in C?

Question

I'm trying to solve a problem with C, how can I make x = input?
In the problem I'm trying to solve the input is a number

Answer 1

For integer:
int x;
scanf("%d",&x);

For decimal number:
double x;
scanf("%lf",&x);

Answer 2

int a;
scanf("%d", &a);

Answer 3

Ty