How to avoiding nullchar converted to 0? [closed]

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The problem here is the condition in the for-loop. That condition is fully evaluated after every iteration. That means not just the r< part, but also the strlen(number) part. This is generally a bad idea – strlen must check the whole sting to find the first \0. In very exceptional situations that might make sense, but here it does not. You want to use the original, unmodified string length.

If you understand strings a bit better, you might realize that you don’t need r at all. You can simply set characters to \0 until you find one that’s already \0.

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