I wrote this tiny code:

#include <stdio.h>
int main() {
    size_t temp;
    temp = 100;

    printf("lld=%lld, ld=%ld, u=%u\n", temp, temp, temp);

    return 0;
}

I am running this on a i386 GNU/Linux machine with gcc version 4.1.1 20070105 (Red Hat 4.1.1-52). This is the output that I got:

lld=429496729700, ld=100, u=7993461

I can understand that the first (lld) was printed as garbage because the printf tries to print 8 bytes (for signed long long as signified by lld) when only 4 bytes are available from variable temp. But, I fail to understand why the last identifier, u is getting printed as garbage - whereas, in my understanding this is the closest applicable identifier for size_t.

Here I have assumed that size_t is unsigned int (which is signed 4 bytes for my i386).

Now, I did a little tweaking with the printf line:

...
printf("ld=%ld, u=%u, lld=%lld\n", temp, temp, temp);
...

and I have a perfectly fine answer (except the lld part).

ld=100, u=100, lld=34331653576851556

Can someone please help me in understanding what exactly am I missing here?

Thanks a lot for any help!

[side note: I tried switching optimization using gcc -O[0,2] tag on/off without any difference in the observation.]

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