c++ - Is it possible to do multiple operations in increment part of for loop in C/C++?

Question

Is it possible to do multiple operations in increment part of for loop in C/C++? Something like this:

int a = 0, b = 0, c = 5;
for(; a < c; increase a by 1 and increase b by 2)

Answer 1

使用逗号运算符：

for (; a < c; ++a, b += 2)

Answer 2

对的，这是可能的。您还可以在循环内声明多个变量，并且之前不需要这样做。

for (int a = 0, b = 0, c = 5; a < c; ++a, b += 2)