C Program to Swap Two C Program to Demonstrate the Working of Keyword 'long'


This program declares 4 variables of type int, float, double and char. Then, the size of each variable is evaluated using sizeof operator.


#include <stdio.h>
int main()
    int a;
    long b;
    long long c;

    double e;
    long double f;

    printf("Size of int = %ld bytes \n", sizeof(a));
    printf("Size of long = %ld bytes\n", sizeof(b));
    printf("Size of long long = %ld bytes\n", sizeof(c));

    printf("Size of double = %ld bytes\n", sizeof(e));
    printf("Size of long double = %ld bytes\n", sizeof(f));

    return 0;


Size of int = 4 bytes 
Size of long = 8 bytes
Size of long long = 8 bytes
Size of double = 8 bytes
Size of long double = 16 bytes