sizeof

 #include<stdio.h>

#include<conio.h>

void main()

{

int i;

float j;

clrscr();

printf("\nSize of interger is %d", sizeof(i));

printf("\nSize of float is %d", sizeof(float));

printf("\nSize of charcter is %d", sizeof(char));

getch();

}

/*

Output:

Size of interger is 2

Size of float is 4

Size of charcter is 1

*/