int evl(char *postfix)
{
    int i=0,x1,x2,r=0;
    for(i=0;postfix[i]!='\0';i++)
    {
        if(isOperand(postfix[i]))
            push(postfix[i]-'0');
        else
        {
            x2=pop();
            x1=pop();
            switch(postfix[i])
            {
                case '+':r=x1+x2;break;
                case '-':r=x1-x2;break;
                case '*':r=x1*x2;break;
                case '/':r=x1/x2;break;
            }
            push(r);
        }
    }
    return pop();
}
int main()
{
    char *postfix="234*+82/-";
    printf("%d",evl(postfix));


}