回答編集履歴
2
コード修正2
answer
CHANGED
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@@ -54,4 +54,102 @@
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54
54
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kotae.value += digit;
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55
55
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};
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56
56
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}
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57
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+
```
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58
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+
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59
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私の答えはこうです。よくある状態遷移です。
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60
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[AC]ボタンはご自身で実装してみてください。
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61
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```JavaScript
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62
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var kotae = document.getElementById('ans');
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63
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+
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64
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var zeroToNine = ["zero", "one", "two", "three", "four",
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65
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"five", "six", "seven", "eight", "nine"];
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66
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var digitButtons = new Array(10);
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67
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+
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68
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// 演算子ボタン
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69
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var operators = ["plus", "minus", "mul", "div"];
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70
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var operatorButtons = new Array(operators.length);
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71
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+
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72
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var calculatingButton = document.getElementById('equ');
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73
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74
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// 状態定数
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75
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var STATE = {
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76
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INITIAL : 0,
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77
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DIGIT_BUTTON_PRESSED_AT_FIRST : 1,
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78
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OPERATOR_BUTTON_PRESSED : 2,
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79
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DIGIT_BUTTON_PRESSED_AT_SECOND : 3,
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80
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CALCULATING_BUTTON_PRESSED : 4
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81
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};
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82
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// 状態変数
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83
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var state = STATE.INITIAL;
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84
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+
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85
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// 数値記憶用
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86
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var memory = 0;
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87
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// 押された演算子
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88
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var pressedOperator = '';
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89
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+
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90
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for (var i = 0; i <= 9; i++) {
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91
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digitButtons[i] = document.getElementById(zeroToNine[i]);
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92
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digitButtons[i].onclick = function() {
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93
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// アラビア数字に変換
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94
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var digit = zeroToNine.indexOf(this.id) + '';
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95
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+
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96
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switch (state) {
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97
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case STATE.INITIAL:
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98
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case STATE.DIGIT_BUTTON_PRESSED_AT_FIRST:
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99
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kotae.value += digit;
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100
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state = STATE.DIGIT_BUTTON_PRESSED_AT_FIRST;
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101
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break;
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102
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+
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103
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case STATE.OPERATOR_BUTTON_PRESSED:
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104
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kotae.value = '';
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105
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// noBreak;
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106
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case STATE.DIGIT_BUTTON_PRESSED_AT_SECOND:
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107
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kotae.value += digit;
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108
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state = STATE.DIGIT_BUTTON_PRESSED_AT_SECOND;
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109
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break;
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110
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+
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111
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}
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112
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};
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113
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}
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114
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115
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for (i = 0; i < operatorButtons.length; i++) {
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116
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operatorButtons[i] = document.getElementById(operators[i]);
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117
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operatorButtons[i].onclick = function() {
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118
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switch (state) {
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119
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case STATE.DIGIT_BUTTON_PRESSED_AT_FIRST:
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120
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case STATE.CALCULATING_BUTTON_PRESSED:
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121
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pressedOperator = this.id;
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122
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memory = parseInt(kotae.value, 10);
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123
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state = STATE.OPERATOR_BUTTON_PRESSED;
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124
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break;
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125
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}
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126
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};
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127
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}
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128
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+
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129
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calculatingButton.onclick = function() {
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130
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if (state === STATE.DIGIT_BUTTON_PRESSED_AT_SECOND) {
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131
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var operand = parseInt(kotae.value, 10);
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132
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133
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switch (pressedOperator) {
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134
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case "plus":
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135
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kotae.value = memory + operand;
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136
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break;
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137
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138
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case "minus":
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139
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kotae.value = memory - operand;
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140
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break;
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141
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+
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142
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case "mul":
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143
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kotae.value = memory * operand;
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144
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break;
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145
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+
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146
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case "div":
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147
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kotae.value = memory / operand;
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148
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break;
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149
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+
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150
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}
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151
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+
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152
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state = STATE.CALCULATING_BUTTON_PRESSED;
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153
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}
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154
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};
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57
155
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```
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1
コード修正
answer
CHANGED
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@@ -32,4 +32,26 @@
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32
32
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}
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33
33
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```
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34
34
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数字のキーはこのようにすると、コードを短縮でき、間違えにくくなります。
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35
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-
2桁以上にも対応しています。
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35
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+
2桁以上にも対応しています。
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36
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+
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37
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+
これでどうですか。
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38
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+
```JavaScript
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39
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+
var kotae = document.getElementById('ans');
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40
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+
var zeroToNine = ["zero", "one", "two", "three", "four",
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41
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"five", "six", "seven", "eight", "nine"];
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42
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var digitElements = new Array(10);
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43
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var tasu = document.getElementById('plus');
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44
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var hiku = document.getElementById('minus');
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45
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var kakeru = document.getElementById('mul');
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46
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var waru = document.getElementById('div');
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47
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var ikoru = document.getElementById('equ');
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48
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+
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49
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+
for (var i = 0; i <= 9; i++) {
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50
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digitElements[i] = document.getElementById(zeroToNine[i]);
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51
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+
digitElements[i].onclick = function() {
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52
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+
// アラビア数字に変換
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53
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+
var digit = zeroToNine.indexOf(this.id) + '';
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54
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+
kotae.value += digit;
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55
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+
};
|
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56
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+
}
|
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57
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+
```
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