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puts()is machine dependent. It's 10 on mine for instance. Also, here's a tip: you can usually compress two loops into one if you conditionally increment the counter in the external loop. My solution demonstrates how it can be done. \$\endgroup\$puts()return code is only guaranteed to be +ve for success. However my testing with glibc seems show that the return value is number of bytes written. As for the loop consolidation - yes, I'm aware of that technique and have tried that here, so far with no shortening in this case. \$\endgroup\$