缘由c语言计算昨天的日期简单-编程语言-CSDN问答
int n = 0, y = 0, t = 0;scanf_s("%d-%d-%d", &n, &y, &t);if (t == 1 && y == 1)printf_s("%d-%02d-%02d\n", --n, 12, 31);else if (t == 1 && y>1)printf_s("%d-%02d-%02d\n", n, --y, 返回月的天数(n, y));else printf_s("%d-%02d-%02d", n, y, --t);