long is a shortcut to long int, short is a shortcut to short int, char is a type, long long doesn't exist in C90

ints.c

#include <stdio.h>
#include <stdlib.h>

int main (int argc, char **argv)
{
     printf ("char: %lu\n", sizeof (char));
     printf ("short: %lu\n", sizeof (short));
     printf ("int: %lu\n", sizeof (int));
     printf ("long: %lu\n", sizeof (long));
     printf ("long long: %lu\n\n", sizeof (long long));

     printf ("char int: %lu\n", sizeof (char int)); // two or more data types in declaration specifiers
     printf ("short int: %lu\n", sizeof (short int));
     printf ("long int: %lu\n", sizeof (long int));
     printf ("long long int: %lu\n\n", sizeof (long long int));

     return EXIT_SUCCESS;
}

/*

# gcc -ansi -pedantic -Wall -Werror ints.c                                                                                                                                             0 (GOLDORAK)
ints.c: In function ‘main’:
ints.c:10:49: error: ISO C90 does not support ‘long long’ [-Werror=long-long]
ints.c:12:46: error: two or more data types in declaration specifiers
ints.c:15:53: error: ISO C90 does not support ‘long long’ [-Werror=long-long]
cc1: all warnings being treated as errors
#

*/