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$ pico count1.c
#include <stdio.h>
/* count1.c - count characters in input, version 1 */
main()
{
    long nc;
    nc = 0;
    while (getchar() != EOF)
        ++nc;
    printf("%ld\n", nc);
}
$ gcc count1.c
$ ./a.out < count1.c
177
$
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1. int might be 16 bits (32,767 max) or 32 bits.
2. long integers at least 32 bits.
3. "%ld" specifies nc as long integer (decimal).
4. prefix increment operator, ++nc, adds 1 to nc (nc = nc + 1).
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