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help me how to use printf in stdio.h

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I used this lib in in previous version of KEIL IDE CARM.And I used printf and sprintf in this lib.I knew that I should retarget two functions getchar and putchar to use printf function in this lib.But now I try using newer version of KEIL IDE RealView (RV30).I can't using "stdio.h" lib. so I can't use printf and sprintf function.This lib is verry strange!It is very differrent from previous version which i have used before.I'm using ARM7 LPC2148.please help me the way to use printf and sprintf or another same functions in stdio.h lib in realview version.Which function i must retarget to use printf? and how can i use sprintf function?
 

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