回答編集履歴
2
追記
test
CHANGED
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@@ -71,3 +71,37 @@
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71
71
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}
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72
72
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73
73
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```
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74
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+
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75
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+
[追記-2] いっそコレ↓でよくね?
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76
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+
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77
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```C++
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78
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79
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#include <cstdio>
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80
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81
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82
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83
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int main() {
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84
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85
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double pcs[2][5]{ 0, 1, 2, 3, 4,
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86
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87
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5, 6, 7, 8, 9 };
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88
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+
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89
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double* PC;
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90
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91
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int N = 0;
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92
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93
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if (N == 1) {
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94
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95
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PC = pcs[0];
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96
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97
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} else {
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98
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99
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PC = pcs[1];
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100
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+
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101
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}
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102
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103
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printf("\n PC[1]=%7.3f\n", PC[1]);
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104
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105
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}
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106
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+
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107
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```
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1
追記
test
CHANGED
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@@ -33,3 +33,41 @@
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33
33
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double pc[5] は {} の外に出ると寿命が尽きてしまいます。
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34
34
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35
35
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死んでしまう変数のポインタ値をアテにしてはいかんのです。
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36
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+
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37
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+
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38
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+
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39
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[追記] これ↓ならOK (staticなのがミソ)
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40
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41
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```C++
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42
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+
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43
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#include <cstdio>
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44
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+
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45
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#include <cstdlib>
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46
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+
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47
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+
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48
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+
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49
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+
int main() {
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50
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+
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51
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double* PC;
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52
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+
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53
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int N = 1;
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54
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+
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55
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if (N == 1) {
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56
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+
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57
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static double pc[5]{ 1, 0.885, 0.826, 0.794, 0.775 };
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58
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+
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59
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PC = pc;
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60
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+
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61
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} else {
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62
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+
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63
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static double pc[5]{ 1, 0.588, 0.826, 0.794, 0.775 };
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64
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+
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65
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PC = pc;
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66
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+
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67
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}
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68
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+
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69
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printf("\n PC[1]=%7.3f\n", PC[1]);
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70
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+
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71
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}
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72
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+
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73
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```
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