text: #include<stdio.h>
  
  #include<math.h>
  
  #include<string.h>
  
  float compute(char symbol, float op1, float op2)
  
  {
  
   switch (symbol)
  
   {
  
    case '+': return op1 + op2;
  
    case '-': return op1 - op2;
  
    case '*': return op1 * op2;
  
    case '/': return op1 / op2;
  
    case '$':
  
    case '^': return pow(op1,op2);
  
    default : return 0;
  
   }
  
  }
  
  void main()
  
  {
  
  float s[20], res, op1, op2;
  
  int top, i;
  
  char postfix[20], symbol;
  
  printf("\nEnter the postfix expression:\n");
  
  scanf ("%s", postfix);
  
  top=-1;
  
  for (i=0; i<strlen(postfix) ;i++)
  
  {
  
  symbol = postfix[i];
  
  if(isdigit(symbol))
  
   s[++top]=symbol - '0';
  
  else
  
   {
  
   op2 = s[top--];
  
   op1 = s[top--];
  
   res = compute(symbol, op1, op2);
  
   s[++top] = res;
  
   }
  
  }
  
  res = s[top--];
  
  printf("\nThe result is : %f\n", res);
  
  }
  