infix-notation

问题 I'm writing a program that reads an Infix notation, converts it to Postfix and then evaluate that Postfix. Here's my program: #include<stdio.h> #include <ctype.h> #define SIZE 50 /* Size of Stack */ char s[SIZE]; int top = -1; /* Global declarations */ push(char elem) { /* Function for PUSH operation */ s[++top] = elem; } char pop() { /* Function for POP operation */ return (s[top--]); } int pr(char elem) { /* Function for precedence */ switch (elem) { case '#': return 0; case '(': return 1;

问题 I'm writing a program that reads an Infix notation, converts it to Postfix and then evaluate that Postfix. Here's my program: #include<stdio.h> #include <ctype.h> #define SIZE 50 /* Size of Stack */ char s[SIZE]; int top = -1; /* Global declarations */ push(char elem) { /* Function for PUSH operation */ s[++top] = elem; } char pop() { /* Function for POP operation */ return (s[top--]); } int pr(char elem) { /* Function for precedence */ switch (elem) { case '#': return 0; case '(': return 1;

问题 Suppose the user inputs an infix expression as a string? What could be the easiest ( By easiest I mean the shortes t) way to evaluate the result of that expression using C language? Probable ways are converting it to a postfix then by using stacks.But its rather a long process. Is there any way of using functions such as atoi() or eval() that could make the job easier? 回答1: Certainly the most instructive way (and possibly even the easiest, once you know how) is to learn how to write your own

问题 I need to write code to correct user input. The input is a mathematical expression in infix form. In order for my calculations to be correct, i need each operand spaced away from the operator. Can you please help me write a method that will provide the following expected results. Expected input: 13*21-5+33 Expected Output: 13 * 21 - 5 + 33 Research I have done: I could only find out how to add spaces between every character in the string and that will not work for calculating expressions with

问题 I need to write code to correct user input. The input is a mathematical expression in infix form. In order for my calculations to be correct, i need each operand spaced away from the operator. Can you please help me write a method that will provide the following expected results. Expected input: 13*21-5+33 Expected Output: 13 * 21 - 5 + 33 Research I have done: I could only find out how to add spaces between every character in the string and that will not work for calculating expressions with

问题 We recently learned about converting infix to postfix using stacks during our programming course at uni. And I have meaning to write my parser for a while, so I decided to it using recursive descent. I am following along with this: Parsing Expressions by Recursive Descent Theodore Norvell . Here is the grammar he uses: E --> P {B P} P --> v | "(" E ")" | U P B --> "+" | "-" | "*" | "/" | "^" U --> "-" | "+" I have attempted at implementing this in C and it works. However If I give it the

问题 val m = scala.collection.mutable.Map[String, Int]() // this doesn't work m += ("foo", 2) // this does work m += (("foo", 2)) // this works too val barpair = ("bar", 3) m += barpair So what's the deal with m += ("foo" , 2) not working? Scala gives the type error: error: type mismatch; found : java.lang.String("foo") required: (String, Int) m += ("foo", 2) ^ Apparently Scala thinks that I am trying to call += with two arguments, instead of one tuple argument. Why? Isn't it unambiguous, since I

问题 I have a java class that converts infix expression to postfix. I have managed to make the class run without errors but it is not giving me the right output. The output is suppose to be in form : InToPost: converting expressions from infix to postfix... [A, +, B] [A, +, B, *, C] [A, +, B, *, C, +, D] [(, A, +, B, ), *, C] [(, A, +, B, ), /, (, C, -, D, )] [(, (, A, +, B, ), *, C, -, (, D, -, E, ), )] InToPost: emitting postfix expressions... A B + A B C * + A B C * + D + A B + C * A B + C D -

问题 I have a java class that converts infix expression to postfix. I have managed to make the class run without errors but it is not giving me the right output. The output is suppose to be in form : InToPost: converting expressions from infix to postfix... [A, +, B] [A, +, B, *, C] [A, +, B, *, C, +, D] [(, A, +, B, ), *, C] [(, A, +, B, ), /, (, C, -, D, )] [(, (, A, +, B, ), *, C, -, (, D, -, E, ), )] InToPost: emitting postfix expressions... A B + A B C * + A B C * + D + A B + C * A B + C D -

问题 (I did ask a similar question in the past, but the documentation was wrong, so this is the correct version of that past question) Please help me in JavaScript: The program that I am coding is one that takes in an expression in prefix notation and outputs the same expression in infix notation. The idea behind this program is as follows: if the user enters + 1 2 the expected output is 1 + 2. All valid symbols are +, -, *, /, and %. The amount of numbers that the user can enter should be