The size of a variable using the sizeof() operator.

#include<stdio.h>
int main()
//the size of a variable using the sizeof() operator.
{
    int i ;
    char c;
    double d;
    float f;
    long l;

    printf("size of integer  = %d bytes\n", sizeof(i));
    printf("size of character  = %d bytes\n", sizeof(c));
    printf("size of double  = %d bytes\n", sizeof(d));
    printf("size of float  = %d bytes\n", sizeof(f));
    printf("size of long  = %d bytes\n", sizeof(l));


    return 0;

}