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25/01/2026
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25/01/2026
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Today I tackled a classic low-level C challenge:
Print all combinations of single-digit numbers in ascending order — using ONLY the putchar function (max 4 times), no char variables, and everything written inside main().
Constraints like this really push you to think deeper about how computers handle characters, ASCII, loops, and output. Enjoy the breakdown!”**
**“One of the things I really enjoy about C programming tasks is how they force you to understand what’s happening under the hood.
This task looks simple — print 0–9 — but the rules make it interesting:
✔ No printf
✔ Only putchar
✔ Max 4 calls
✔ No char types
✔ Output must be formatted perfectly
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