回答編集履歴
3
追記
test
CHANGED
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@@ -115,3 +115,97 @@
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115
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usr ~/Project/test/teratail %
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```
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118
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119
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もとのソースのアセンブル結果(clang)
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120
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121
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```asm
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122
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123
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.text
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125
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.file "t.c"
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126
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127
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.globl main # -- Begin function main
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128
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129
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.p2align 4, 0x90
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130
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131
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.type main,@function
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132
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133
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main: # @main
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134
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135
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.cfi_startproc
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136
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137
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# %bb.0:
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139
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subq $24, %rsp
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140
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141
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.cfi_def_cfa_offset 32
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142
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143
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movl $100, 12(%rsp)
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144
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145
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movl $.L.str, %eax
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146
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147
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movb %al, 11(%rsp)
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148
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149
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movl $.L.str.1, %edi
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150
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151
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movl $100, %esi
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152
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153
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xorl %eax, %eax
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154
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155
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callq printf
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156
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157
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leaq 8(%rsp), %rdi
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158
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159
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callq puts
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160
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161
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xorl %eax, %eax
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162
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addq $24, %rsp
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165
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.cfi_def_cfa_offset 8
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retq
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168
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.Lfunc_end0:
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170
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.size main, .Lfunc_end0-main
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.cfi_endproc
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# -- End function
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.type .L.str,@object # @.str
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179
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.section .rodata.str1.1,"aMS",@progbits,1
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180
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181
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.L.str:
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182
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.asciz "OK"
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184
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185
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.size .L.str, 3
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186
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187
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.type .L.str.1,@object # @.str.1
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190
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.L.str.1:
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.asciz "%d\n"
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.size .L.str.1, 4
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196
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198
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199
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200
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201
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.ident "clang version 8.0.0 (trunk 350063)"
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202
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203
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.section ".note.GNU-stack","",@progbits
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.addrsig
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206
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```
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209
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「movb %al, 11(%rsp)」これを見ると、うまい具合wにいけてますね。puts()呼んでる＾＾；
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210
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211
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こちらの結果は、「100以外何も表示されない」です。たぶん'\0'が有った。
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2
ソース追記
test
CHANGED
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@@ -15,3 +15,103 @@
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15
15
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```
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16
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でもいいけど・・・
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「追記」
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ソース改変しました。
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```c
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25
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#include <stdio.h>
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26
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//#include <stdlib.h>
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30
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31
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typedef struct {
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32
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char name[3];
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34
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35
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int number;
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36
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double average;
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39
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} ABC;
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40
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41
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42
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43
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typedef struct {
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44
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45
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char ID[3];
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46
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ABC data;
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48
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49
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int at;
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50
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51
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} DEF;
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52
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53
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54
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55
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int main(void)
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56
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57
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{
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ABC abc;
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60
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61
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ABC *pabc;
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63
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pabc = &abc;
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64
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65
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abc.number = 100;
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66
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abc.name[0] = 'O';
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68
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69
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abc.name[1] = 'K';
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70
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abc.name[2] = '\0';
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72
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73
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// abc.name[3] = "OK";
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74
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75
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DEF b[] = { { "t2", { "x6", 200, 21.2 }, 12 },
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76
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77
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{ "t3", { "x7", 300, 13.3 }, 13 },
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78
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79
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{ "t4", { "xA", 400, 77.1 }, 14 } };
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80
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81
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82
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83
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printf("%d\n", pabc->number);
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84
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85
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printf("%s\n", pabc->name);
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86
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87
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88
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89
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return 0;
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90
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91
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}
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92
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93
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```
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94
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95
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bが使われていない！ワーニングは出ますが・・・
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96
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97
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```text
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98
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99
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usr ~/Project/test/teratail % cc t176513.c
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100
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101
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t176513.c:26:9: warning: unused variable 'b' [-Wunused-variable]
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102
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103
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DEF b[] = { { "t2", { "x6", 200, 21.2 }, 12 },
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104
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105
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^
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106
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107
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1 warning generated.
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108
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109
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usr ~/Project/test/teratail % ./a.out
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110
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111
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100
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112
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113
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OK
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114
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115
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usr ~/Project/test/teratail %
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116
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117
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```
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1
追記
test
CHANGED
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@@ -2,4 +2,16 @@
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2
2
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3
3
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C言語は文字列の代入は出来ません。strcpy()を使いましょう。
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4
4
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5
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-
・・・添え字はおかしい
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5
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・・・添え字はおかしい（3番めはない）
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6
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7
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```ｃ
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8
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9
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abc.name[0] = 'O';
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10
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11
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abc.name[1] = 'K';
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12
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13
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abc.name[2] = '\0';
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14
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15
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```
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16
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17
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でもいいけど・・・
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