tags: C++
categories: C++
理解
一图胜千言
我愿称之为最强
c - Difference between r+ and w+ in fopen() - Stack Overflow;
需要注意里面的a和 a+, 区别在于 a 不可以读而 a+可以读.
c - Difference between r+ and w+ in fopen() - Stack Overflow;
Mode | Read | Write | Create New File if not exist | Truncate |
r | ✅ | ❌ | ❌ | ❌ |
w | ❌ | ✅ | ✅ | ✅ |
a | ❌ | ✅ | ✅ | ❌ |
r+ | ✅ | ✅ | ❌ | ❌ |
w+ | ✅ | ✅ | ✅ | ✅ |
a+ | ✅ | ✅ | ✅ | ❌ |
总结:
-
+表示读写
