What is the difference between long int and long long int?

Asked Mar 26 '20 at 14:59

Active Mar 26 '20 at 15:01

Viewed 60 times

I am using gcc version 5.4.0 20160609, 64 bit. When I tried to find the size of long int and long long int using sizeof operator it shows the size as 8 for both long int and long long int. Then What is the use of this long long type qualifier? When does the use of this qualifier come into picture?

The piece of code I used to find the size is given below:

#include <stdio.h>

int main(void)
{
    printf("size of long int: %lu\n", sizeof(long int));
    printf("size of long long int: %lu\n", sizeof(long long int));

    return 0;
}

out put is:

size of long int: 8
size of long long int: 8

edited Mar 26 '20 at 15:01

John Kugelman

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asked Mar 26 '20 at 14:59

Vinie

`long long int` rank is greater than `long int` rank, see http://port70.net/~nsz/c/c11/n1570.html#6.3.1.1 – pmg Mar 26 '20 at 15:01
3

Sizes of the builtin types can depend on the compiler and/or architecture. `long` is 4 bytes large on MinGW. – HolyBlackCat Mar 26 '20 at 15:02
1

See this post https://stackoverflow.com/questions/18971732/what-is-the-difference-between-long-long-long-long-int-and-long-long-i – Mandy007 Mar 26 '20 at 15:07
Within that post there is an answer with a link to the memory model: https://en.wikipedia.org/wiki/64-bit_computing#64-bit_data_models – Craig Estey Mar 26 '20 at 15:51
Vine, Curios, why did code use `"%lu"`? – chux - Reinstate Monica Mar 26 '20 at 17:46
@chux-ReinstateMonica result of sizeof is of unsigned type which is usually denoted by size_t – Vinie Mar 29 '20 at 04:47
`"%lu"` matches `unsigned long`. `"%zu"` matches `size_t`. Why did code assume `size_t` matched `unsigned long`? – chux - Reinstate Monica Mar 29 '20 at 13:57

What is the difference between long int and long long int?

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