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结构中使用复合字面量,
我们有一个结构:
1 struct date 2 { 3 int year; 4 int month; 5 int day; 6 };
一般给这个结构赋值会是:
1 struct date today = {2015,7,28}; 2 // 或者是 3 // struct date today = 4 // {.day = 28, .year = 2015, .month = 7};
而用复合字面量的方式:
1 today = (struct date){2015, 7, 28}; 2 //或是 3 //today = (struct date){.month = 7, .day = 28, .year = 2015};
这样看起来似乎没什么卵用,但是把复合字面量运用到程序当中去会发现很是方便:
// 普通运用 // if (today != 30){ // tomorrow.day = today.day + 1; // tomorrow.month = today.month; // tomorrow.year = today.year; // 复合字面量运用 if (today.day != 60) tomorrow = (struct date){today.month, today.day + 1, today.year};
同样的运行结果,运用复合字面量会直观很多,也更为方便。
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原文地址:http://www.cnblogs.com/Thorpe/p/4683501.html