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Message: [QUOTE="Michael Mair, post: 2408028"] size_t is the type of the result of the sizeof operator and the type of argument taken by the dynamic memory allocation routines malloc/calloc/realloc -- so, basically, every object you work with has a size in bytes which can be expressed in size_t. The same guarantee does not hold for short, int, long of either signed or unsigned variety. So, using size_t for your index variables, you can _never_ (*) go wrong. The downside is that you have to be more careful with your loop tests as unsigned integer types never can provide values <0. (*) never: There are no absolutes. Using automatic or static or dynamically allocated storage, within standard C you will be on the safe side. Note that size_t has not to be large enough to count, for example, the number of bytes in a file. [snip: solved problem] Cheers Michael [/QUOTE]