Created
August 29, 2014 22:11
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C#+Windowsフォームで作るダメな電卓例 ref: http://qiita.com/yukkuribemani/items/f0fe2c9f029531a62d5b
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| using System; | |
| using System.Drawing; | |
| using System.Text; | |
| using System.Windows.Forms; | |
| namespace calc | |
| { | |
| public partial class Form1 : Form | |
| { | |
| private bool init_flag = true; // 計算終了後の初期化フラグ | |
| public Form1() | |
| { | |
| InitializeComponent(); | |
| } | |
| // 数値ボタン | |
| private void btnNumber_Click(object sender, EventArgs e) | |
| { | |
| textBoxCalc.Text += ((Button)sender).Text; | |
| } | |
| // 演算子ボタン | |
| private void Op_Click(object sender, EventArgs e) | |
| { | |
| textBoxCalc.Text += ((Button)sender).Text; | |
| } | |
| // 小数点ボタン | |
| private void point_Click(object sender, EventArgs e) | |
| { | |
| textBoxCalc.Text += '.'; | |
| } | |
| // クリア(C)ボタン | |
| private void Clear_Click(object sender, EventArgs e) // 式の初期化 | |
| { | |
| textBoxCalc.Text = String.Empty; | |
| init_flag = true; | |
| } | |
| private void eq_Click(object sender, EventArgs e) // 式の計算を行う | |
| { | |
| int next_op_pos = 0 | |
| int before_op_pos = 0; | |
| char ch = ' '; | |
| char next_op = ' '; | |
| char before_op = ' '; | |
| string num = string.Empty; | |
| double left=0.0; //演算子で式を分けた時の左と右の数値 | |
| double right = 0.0; | |
| double result = 0.0; | |
| bool calc_flag = true; // 計算したかどうかのフラグ | |
| bool op_flag = true; // 取得した | |
| textBoxCalc.Text += '='; | |
| // フォームに何も入れずに"="を押した場合 | |
| if(textBoxCalc.Text == "") | |
| { | |
| MessageBox.Show("式を入力してください。", | |
| "入力エラー", MessageBoxButtons.OK, MessageBoxIcon.Error); | |
| return; | |
| } | |
| if (init_flag == false)//計算終了後に=を押したときの対策 | |
| return; | |
| for (int i = 0; i < textBoxCalc.Text.Length;i++) //フォームから1文字ずつ読みだす | |
| { | |
| ch = textBoxCalc.Text[i]; | |
| if (Char.IsDigit(ch) == true || ch == '.') //数値もしくは小数点の場合 | |
| { | |
| num += ch; //数値のコピーをとっておく | |
| } | |
| else if (ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '=')//いずれかの演算子の場合 | |
| { | |
| if (ch != '=') | |
| { | |
| if (op_flag == true) // 演算子の場合 | |
| { | |
| before_op_pos = i; | |
| before_op = ch; | |
| op_flag = false; | |
| } | |
| else | |
| { | |
| next_op_pos = i; | |
| next_op = ch; | |
| } | |
| } | |
| if (calc_flag) | |
| { | |
| left = double.Parse(textBoxCalc.Text.Substring(0, num.Length));//初回の計算のみleftを取得 | |
| calc_flag = false; | |
| num = string.Empty; | |
| } | |
| // 2回目以降の計算 | |
| else | |
| { | |
| right = double.Parse(textBoxCalc.Text.Substring(before_op_pos + 1, num.Length)); | |
| result = calc(left, right, before_op); | |
| left = result; | |
| num = string.Empty; | |
| op_flag = true; | |
| before_op_pos = next_op_pos; | |
| before_op = next_op; | |
| } | |
| } | |
| else | |
| return; | |
| } | |
| textBoxCalc.Text = result.ToString(); | |
| init_flag = false; | |
| calc_flag = true; | |
| } | |
| // 計算用メソッド | |
| private double calc(double x, double y,char op) | |
| { | |
| double ans = 0.0; | |
| switch(op) | |
| { | |
| case '+': | |
| ans = x + y; | |
| break; | |
| case '-': | |
| ans = x - y; | |
| break; | |
| case '*': | |
| ans = x * y; | |
| break; | |
| case '/': | |
| ans = x / y; | |
| break; | |
| } | |
| return ans; | |
| } | |
| } | |
| } |
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