我被要求作为一个额外的编程挑战,查看随机字符串或字符中的大括号是否匹配,比如:{1+1}这将返回1,而{1+1})将返回0。以下是我的代码,但似乎没有做任何事情。任何帮助都将是伟大的?谢谢
//bonus.cpp
#include <iostream>
#include <string>
#include <queue>
#include <stack>
using namespace std;
int checkBraces (string s)
{
//int myLength = s.length();
std::stack<int> stack;
char d;
for (int i = 0; i < s.length(); i++)
{
char c = s[i];
if (c == '(')
{
stack.push(c);
}
else if (c == '[')
{
stack.push(c);
}
else if (c == '{')
{
stack.push(c);
}
else if (c == ')')
{
if (stack.empty())
{
return false;
}
else
{
d = stack.top();
stack.pop();
if (d != '(')
{
return false;
}
}
}
else if (c == ']')
{
if (stack.empty())
{
return false;
}
else
{
d = stack.top();
stack.pop();
if (d != '[')
{
return false;
}
}
}
else if (c == '}')
{
if (stack.empty())
{
return false;
}
else
{
d = stack.top();
stack.pop();
if (d != '{')
{
return false;
}
}
}
}
if (stack.empty()) return true;
else return false;
}
int main()
{
cout << "This program checks brace ([{}]) matching in a string." << endl;
checkBraces ("{1+1}");
}
bool pop_if_possible(std::stack<char>, char)
方法,这样你就可以写成if (c==')' && !pop_if_possible(stack, '(')) { return false; }
。 - MSalters