For 0x1234:

In memory, the least significant byte is 34, and the most significant byte is 12.
When written to the file in binary format, the bytes are written in little-endian order.
Therefore, the hexdump shows 34 12 00 00, with the least significant byte 34 appearing first.

For 0x12345678:

In memory, the least significant byte is 78, and the most significant byte is 12.
When written to the file in binary format, the bytes are written in little-endian order.
Therefore, the hexdump shows 78 56 34 12, with the least significant byte 78 appearing first.


--

To save int only can save to text, binary

This post has been edited by cytyler: May 24 2023, 08:18 AM

#include <stdio.h>

int main()
{
unsigned long long long_integer = 0x0000001234567890;
FILE *fptr;

fptr = fopen("C:\\Users\\BOO\\Projects\\integer.bin", "wb");


fwrite(&long_integer, sizeof(unsigned long long), 1, fptr);

fclose(fptr);

return 0;
}