Using strtok() together with fgets() causes a segfault, but pointers should be correct?

Most likely problem is that your first input line doesn't begin with a lower case letter, so you never call strtok in the first place, and never assign to either svar or fvar, but you still pass those (uninitialized) values to printf, which then gives a segfault...

Strtok can return NULL. If you ignore that possibility, access violations are easy to cause. Always check the return status of a function you call.

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