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;elsereturnInfinity; } }else...
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...
A simple expression has a type, which is either a primitive type or a reference type. In these examples, 52 is a 32-bit integer (int); System.out.println("ABC"); is void (void) because it returns no value; "Java" is a string (String); 98.6D is a 64-bit double-precision ...
A simple expression has a type, which is either a primitive type or a reference type. In these examples, 52 is a 32-bit integer (int); System.out.println("ABC"); is void (void) because it returns no value; "Java" is a string (String); 98.6D is a 64-bit double-precision ...