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Message: [QUOTE="James Dow Allen, post: 5021184"] (9/5) is 1 Write something else, e.g. (9.0/5) or even (1.8) if you want 1.8 instead of 1. That statement happens to lead to a chain of promotions that work as you intend. Better, however, is to avoid confusion or incorrectness by avoiding integer when you want floats. Thus write fahr=celsius * 9./5. + 32.; and don't worry about promotions. Oh, C++. That's that language two doors down the hall? The language that magically handles typing for you? That you have the above confusion and had to come to the C forum (not a C++ forum) to get it corrected tells us something about C++. :-) James [/QUOTE]