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Message: [QUOTE="santosh, post: 2489555"] Also flexible/generic code. In the sense that all data processing functions are interpreters? This will duplicate each value of i. Horrible. Might as well program in assembly. This will break fantastically upon any modification. And what if the bounds of i is 100000. You plan on writing that out as a string literal? printf() is more convinient for converted and formatted output. If you're forced to use puts(), over time you'll tend to duplicate most of printf()'s functionality, and ofcourse your replica won't be portable. Yes, most I/O is often so slow compared to the processor that it's probably waste of time to try to micro-optimise I/O routines. [/QUOTE]