// Original do/while Macro //原始的do/while宏 #define MY_ASSERT_ONE(x) do { \ if (!(x)) {\ _asm int 3 \ } \ } while(0) // new Macro that removes the loop // 新宏移去了loop #define MY_ASSERT_ONE(x) { \ if (!(x)) { \ _asm int 3 \ } \ }
代码清单 4 避免一个编译器错误 (a). /* This code will cause a compile error */ /* 此段代码将产生一个编译器错误 */ void main(void) { int i = 10; printf("i: %d\n", i); int j = 100; /* This statement will cause a compiler error since it was not declared at the top of the function. */ /* 此语句将导致一个编译器错误， 因为它未在函数顶部声明过。 */ printf("j: %d\n", j);} (b). /* whereas this code will not */ /*而此段代码将不产生一个编译器错误*/ void main(void) { int i = 10; printf("i: %d\n", i); { int j = 100; /* This statement is fine since it is akin to defining a local function within the function. */ /* 此语句很精炼， 因为它在函数中定义了一局部函数的同族。*/ printf("j: %d\n", j); } }
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