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This article is about how to use Unity to make a simple calculator. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

I. Preface

Hello, meet again today to share how to use Unity to make calculators, which are moderately difficult and can be used to learn or import as widgets for other projects.

Of course, it can also be exported and released to the web side to make an embedded tool.

2. Effect drawing and source project

Effect picture:

Source engineering

Third, to achieve 1. Interface building

< S.Length; i++) { c = S[i]; //added c==',' for germany culture if (char.IsDigit(c) || c == '.' || c == ',') { //数据值收集. Operand.Append(c); } else if (c == ' ' && Operand.Length >

0) {# region Operand conversion try {tmp = Operand.ToString (); if (tmp.StartsWith ("-")) / / negative conversion must be careful. It is not directly supported. {/ / now this branch of my algorithm may never be executed. Sk.Push (- (double) Convert.ToDouble (tmp.Substring (1, tmp.Length-1);} else {sk.Push (Convert.ToDouble (tmp)) }} catch {return null; / /} Operand = new System.Text.StringBuilder () # endregion} else if (c = ='+'/ / operator processing. Binocular operation processing. | | c = ='-'| | c = ='*'| | c = ='/'| | c = ='%'| | c = ='^') {# region binocular operation if (sk.Count > 0) / * if entered Does not contain an operator at all. Or it is an empty string at all. The logic here makes sense. * / {y = (double) sk.Pop ();} else {sk.Push (0); break } if (sk.Count > 0) x = (double) sk.Pop (); else {sk.Push (y); break } switch (c) {case'+': sk.Push (x + y); break; case'-': sk.Push (x-y) Break; case'*': if (y = = 0) {sk.Push (x * 1) } else {sk.Push (x * y);} break Case'/': if (y = = 0) {sk.Push (x / 0) } else {sk.Push (x / y);} break Case'%': sk.Push (x% y); break Case'^': / / if (x > 0) / / {/ / I was also thinking about what to do if the number being calculated is negative and the power of the true fraction is to be opened. Then I thought I'd forget it. Sk.Push (System.Math.Pow (x, y)) / /} / / else// {/ / double t = y / / string ts = ""; / / t = 1 / (2 * t); / / ts = t.ToString () / / if (ts.ToUpper () .LastIndexOf ('E') > 0) / / {/ / / /} / /} break } # endregion} else if (c = ='!') / / monocular inversion. ) {sk.Push (- (double) sk.Pop ());}} if (sk.Count > 1) {return null;//;} if (sk.Count = = 0) {return null;// } return sk.Pop ();} / * / private string BuildingRPN (string s) {System.Text.StringBuilder sb = new System.Text.StringBuilder (s); System.Collections.Stack sk = new System.Collections.Stack () System.Text.StringBuilder re = new System.Text.StringBuilder (); char c =''; / / sb.Replace ("", "); / / at first, I only removed the spaces. Later, I didn't want to support the full OUT that functions and constants can filter out. For (int I = 0; I

< sb.Length; i++) { c = sb[i]; //added c==',' for german culture if (char.IsDigit(c) || c == ',')//数字当然要了. re.Append(c); //if( char.IsWhiteSpace( c )|| char.IsLetter(c);//如果是空白,那么不要.现在字母也不要. //continue; switch (c)//如果是其它字符...列出的要,没有列出的不要. { case '+': case '-': case '*': case '/': case '%': case '^': case '!': case '(': case ')': case '.': re.Append(c); break; default: continue; } } sb = new System.Text.StringBuilder(re.ToString()); #region 对负号进行预转义处理.负号变单目运算符求反. for (int i = 0; i < sb.Length - 1; i++) if (sb[i] == '-' && (i == 0 || sb[i - 1] == '(')) sb[i] = '!'; //字符转义. #endregion #region 将中缀表达式变为后缀表达式. re = new System.Text.StringBuilder(); for (int i = 0; i < sb.Length; i++) { if (char.IsDigit(sb[i]) || sb[i] == '.')//如果是数值. { re.Append(sb[i]); //加入后缀式 } else if (sb[i] == '+' || sb[i] == '-' || sb[i] == '*' || sb[i] == '/' || sb[i] == '%' || sb[i] == '^' || sb[i] == '!')//. { #region 运算符处理 while (sk.Count >

0) / / if the stack is not empty {c = (char) sk.Pop (); / / pops up the operator in the stack. If (c = ='(') / / if left parenthesis is found. Stop。 {sk.Push (c); / / press the pop-up left parenthesis back. Because there are closing parentheses to match it. Break; / / interrupt. } else {if (Power (c)

< Power(sb[i]))//如果优先级比上次的高,则压栈. { sk.Push(c); break; } else { re.Append(' '); re.Append(c); } //如果不是左括号,那么将操作符加入后缀式中. } } sk.Push(sb[i]); //把新操作符入栈. re.Append(' '); #endregion } else if (sb[i] == '(')//基本优先级提升 { sk.Push('('); re.Append(' '); } else if (sb[i] == ')')//基本优先级下调 { while (sk.Count >

0) / / if the stack is not empty {c = (char) sk.Pop (); / / pop Operator if (c! ='(') {re.Append ('') Re.Append (c); / / the main purpose of adding spaces is to prevent parsing errors caused by irrelevant data. Re.Append ('');} else break;}} else re.Append (SB [I]);} while (sk.Count > 0) / / this is the last bullet stack. {re.Append ('); re.Append (sk.Pop ());} # endregion re.Append (''); return FormatSpace (re.ToString ()); / / format the expression here. This is the suffix. } / / priority test function. / / private static int Power (char opr) {switch (opr) {case'+': case'-': return 1 Case'*': case'/': return 2; case'%': case'^': case'!': return 3; default: return 0 } / normalize the inverse Polish expression. / / private static string FormatSpace (string s) {System.Text.StringBuilder ret = new System.Text.StringBuilder (); for (int I = 0; I

< s.Length; i++) { if (!(s.Length >

I + 1 & & s [I] ='& & s [I + 1] =') ret.Append (s [I]); else ret.Append (s [I]);} return ret.ToString (); / / .replace ('!','-') Thank you for your reading! This is the end of this article on "how to use Unity to make a simple calculator". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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