// 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); }}
