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Message: [QUOTE="Richard Heathfield, post: 2468875"] CBFalconer said: Only if b is greater than or equal to a, and provided you don't want b to be an allowable result unless it is 0. And why all those casts? And why the lousy names a and b? Here's a version which eschews the casts, fixes the names, and sorts out the problem of the parameters being in an inconvenient order. #include <stdlib.h> size_t RandRange(size_t low, size_t high) { if(low > high) { size_t t = low; low = high; high = t; } return (high - low + 1) * (rand() / (RAND_MAX + 1.0) + low; } [/QUOTE]