How to use casting operator in c language

#include <stdio.h>
  int main()
  {
    int x = 5, y = 2;
    float p, q;
    p = x / y;
    printf("p = %.2f\n", p);
    q = (float)x / y;
    printf("q = %f\n", q);
    return 0;
  }
  

p = 2.00
  q = 2.500000