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