Write a function to check for balancing { and } in C programming language. (Assume that the entire program to be checked is given as a null-terminated string).

Balanced

Explanation:

// CPP program to check for balanced parenthesis.  

#include<bits/stdc++.h>  

using namespace std;  

// function to check if paranthesis are balanced  

bool areParanthesisBalanced(string expr)  

{  

   stack<char> s;  

   char x;  

   // Traversing the Expression  

   for (int i=0; i<expr.length(); i++)  

   {  

       if (expr[i]=='('||expr[i]=='['||expr[i]=='{')  

       {  

           // Push the element in the stack  

           s.push(expr[i]);  

           continue;  

       }  

       // IF current current character is not opening  

       // bracket, then it must be closing. So stack  

       // cannot be empty at this point.  

       if (s.empty())  

          return false;  

       switch (expr[i])  

       {  

       case ')':  

           // Store the top element in a  

           x = s.top();  

           s.pop();  

           if (x=='{' || x=='[')  

               return false;  

           break;  

       case '}':  

           // Store the top element in b  

           x = s.top();  

           s.pop();  

           if (x=='(' || x=='[')  

               return false;  

           break;  

       case ']':  

           // Store the top element in c  

           x = s.top();  

           s.pop();  

           if (x =='(' || x == '{')  

               return false;  

           break;  

       }  

   }  

   // Check Empty Stack  

   return (s.empty());  

}  

// Driver program to test above function  

int main()  

{  

   string expr = "{()}[]";  

   if (areParanthesisBalanced(expr))  

       cout << "Balanced";  

   else

       cout << "Not Balanced";  

   return 0;  

}

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