C++ program for matching braces in a parenthesised algebraic expression.

This is a simple C++ program which checks for matching braces in a parenthesised algebraic expression. If the match is successful, the function defined will return 1 or else return 0. The program goes as follows:

#include 
#include 
#include 
int match_paren(char str[20])
{
 int i, j;
 cout << "\n\tThe entered string is ";
 for (i = 0; str[i] != '\0'; i++)
  cout << str[i];
 int stp = 0; // Let starting parenthesis is 0
 int enp = 0; // and ending parenthesis is also 0
 for (i = 0; str[i] != '\0'; i++)
 {
  if (str[i] == '(')
   stp = stp + 1;
  else
   if (str[i] == ')')
    enp = enp + 1;
 }
 if (stp == enp)
  return 1;
 else
  return 0;
}
void main()
{
 clrscr();
 int ctr;
 char nstr[20];
 cout << "Enter any algebraic equation : ";
 gets(nstr);
 ctr = match_paren(nstr);
 if (ctr == 1)
  cout << "\nThe parenthesis are match equally";
 else
  cout << "\nParenthesis are not matched";
}

Source: www.LearnCandCpp.com

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