C++
#include <iostream > using nanespace atd truct aode char el node ett ode right: node(int elenent)t this-zelenentelement: left- right-NULL 1 node* constructExpression(string expr)i stackcnode myStack; for { int if lisdigit(expr(4))){ //If the ayebo! ¡』operand, we create a ose-node tree and push a pointer to it onto a tack. i-0; icexpr·length() ǐ++){ //The symbol fron the expre88ion is read ore at tine fcreate a
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