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Tag paste operator (＃)
2022-07-03 09:07:00 【Fat muscle duality】
// example 1：
#define n 1
#define _USART(x) USART##x
#define USART(x) _USART(x)
USART(1) ==> USART1
USART(n) ==> USART1
// example 2：
#define n 1
#define USART(x) USART##x
USART(1) ==> USART1
USART(n) ==> USARTn
It's too blue and thin to write code on it
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