Data structure C++: stack

for ( each character ch in the string)

{

if (ch is an operand)

Push the value of the operand ch onto the stack

else //ch is an operator named op

{

// evaluate and push the the result

Operand2 = top of stack

Pop the stack

Operand1 = top of stack

Pop the stack

Result = operand1 op operand 2

Push result onto the stack

}

}

What is the result of this postfix expression: 54+2*3/