c语言宏中”#”和”##”的用法
我们使用#把宏参数变为一个字符串,用##把两个宏参数贴合在一起。
#define STR(s) #s #define CONS(a,b) int(a##e##b) printf(STR(vck)); // 输出字符串”vck” printf(”%d\n”, CONS(2,3)); // 2e3 输出:2000
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我们使用#把宏参数变为一个字符串,用##把两个宏参数贴合在一起。
#define STR(s) #s #define CONS(a,b) int(a##e##b) printf(STR(vck)); // 输出字符串”vck” printf(”%d\n”, CONS(2,3)); // 2e3 输出:2000
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