C++：stack.pop() error: cannot initialize a variable of type ‘char‘ with an rvalue of type ‘void‘

LeetCode 中程序的报错位置如下

for(int i=0; i<sz; i++){char c=s.pop();str.push_back(c);
}

执行结果：

编译出错
Line 14: Char 18: error: cannot initialize a variable of type ‘char’ with an rvalue of type ‘void’ char c=s.pop(); ^ ~~~~~~~1 error generated.

解决方法：

因为pop()只负责清除栈顶元素，不负责返回，所以返回的是void。应该先top()写出栈顶元素的值，再pop()弹出。

Note：
将 char 字符链接成 string 字符串的方法，使用 push_back 逐个追加字符。

for(int i=0; i<sz; i++){char c=s.top();s.pop();str.push_back(c);
}

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C++：stack.pop() error: cannot initialize a variable of type ‘char‘ with an rvalue of type ‘void‘

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