Program in C to find size of any variable

Write a program in C to find size of any variable

#include <stdio.h>

#include <conio.h>

void main()

{

          int a;

          float b;

          double c;     

          char ch;

          long d;        

          char nm[10];

          clrscr();

          printf("\nInt size is \t:%d", sizeof (a));

          printf("\nFloat size is \t:%d", sizeof (b));

          printf("\nDouble size is \t:%d", sizeof (c));

          printf("\nChar size is \t:%d", sizeof (ch));

          printf("\nLong size is \t:%d", sizeof (d));

          printf("\nString size is \t:%d", sizeof (nm));

          getch ();

}