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Message: [QUOTE="David Thompson, post: 2896729"] In C99 not actually UB; instead either an implementation-defined conversion or an implementation-defined signal is raised. This is still unportable, but not the full evil of UB. s/could/must/ as size_t must be unsigned and %d expects signed. However, if size_t happens to be unsigned int it _probably_ works. For a user-written vararg function, substituting for a signed int an unsigned int with a value in the range of signed int -- and here the value is 99 which is portably within range -- is guaranteed. There is no explicit provision this works for non-user-written sprintf, but generally it uses the same mechanism(s) and does. OTOH size_t can be an unsigned type other than (and larger than) unsigned int, and then it probably won't work and is definitely UB. - formerly david.thompson1 || achar(64) || worldnet.att.net [/QUOTE]