x=stack[top--]; y=stack[top];if(expr[i]=='+') stack[top]=y+x;elsestack[top]=y-x; }elsereturnInfinity; } }elseif(expr[i]=='*'||expr[i]=='/') {if(top) { x=stack[top--]; y=stack[top];if(expr[i]=='*') stack[top]=y*x;else{if(x) stack[top]=y/x;elseretur...
6-5 Evaluate Postfix Expression (25分) Write a program to evaluate a postfix expression. You only have to handle four kinds of operators: +, -, x, and /. ElementTypeEvalPostfix(char*expr ); whereexprpoints to a string that stores the postfix expression. It is guaranteed that there is e...
Java applications evaluate expressions. Evaluating an expression produces a new value that can be stored in a variable, used to make a decision, and more.How to write simple expressionsA simple expression is a literal, variable name, or method call. No operators are involved. Here are some ...
ElementType EvalPostfix( char *expr ); 1. whereexprpoints to a string that stores the postfix expression. It is guaranteed that there is exactly one space between any two operators or operands. The functionEvalPostfixis supposed to return the value of the expression. If it is not a legal p...
A simple expression has atype, which is either a primitive type or a reference type. In these examples,52is a 32-bit integer (int);System.out.println("ABC");is void (void) because it returns no value;"Java"is a string (String);98.6Dis a 64-bit double-precision floating-point value...