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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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