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5
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1 {
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2 "cells": [
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3 {
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4 "cell_type": "markdown",
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5 "metadata": {},
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6 "source": [
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7 "# Valid code"
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8 ]
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9 },
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10 {
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11 "cell_type": "code",
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12 "execution_count": 1,
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13 "metadata": {
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14 "collapsed": false
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15 },
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16 "outputs": [
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17 {
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18 "name": "stderr",
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19 "output_type": "stream",
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20 "text": []
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21 },
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22 {
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23 "name": "stdout",
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24 "output_type": "stream",
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25 "text": [
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26 "Hello world\n"
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27 ]
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28 }
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29 ],
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30 "source": [
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31 "#include <stdio.h>\n",
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32 "\n",
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33 "int main() {\n",
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34 " printf(\"Hello world\\n\");\n",
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35 "}"
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36 ]
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37 },
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38 {
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39 "cell_type": "markdown",
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40 "metadata": {},
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41 "source": [
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42 "But the kernel will also display compilations warnings and errors if we have some. Let's try to remove the `#include <stdio.h>` statement, which if necessary for `printf` to work."
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43 ]
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44 },
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45 {
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46 "cell_type": "markdown",
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47 "metadata": {},
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48 "source": [
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49 "# Code generating warnings during compilation"
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50 ]
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51 },
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52 {
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53 "cell_type": "code",
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54 "execution_count": 2,
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55 "metadata": {
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56 "collapsed": false
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57 },
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58 "outputs": [
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59 {
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60 "name": "stderr",
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61 "output_type": "stream",
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62 "text": [
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63 "/var/folders/31/qct57s856n5f0b2r4tgbmn1c0000gn/T/tmp0Qan0v.c:2:5: warning: implicitly declaring library function 'printf' with type 'int (const char *, ...)' [-Wimplicit-function-declaration]\n",
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64 " printf(\"Hello world\\n\");\n",
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65 " ^\n",
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66 "/var/folders/31/qct57s856n5f0b2r4tgbmn1c0000gn/T/tmp0Qan0v.c:2:5: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'\n",
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67 "1 warning generated.\n"
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68 ]
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69 },
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70 {
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71 "name": "stdout",
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72 "output_type": "stream",
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73 "text": [
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74 "Hello world\n"
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75 ]
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76 }
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77 ],
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78 "source": [
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79 "int main() {\n",
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80 " printf(\"Hello world\\n\");\n",
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81 "}"
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82 ]
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83 },
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84 {
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85 "cell_type": "markdown",
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86 "metadata": {},
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87 "source": [
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88 "You can see that the warning are displayed, but the code is still executed."
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89 ]
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90 },
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91 {
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92 "cell_type": "markdown",
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93 "metadata": {},
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94 "source": [
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95 "# Code generating errors during compilation"
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96 ]
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97 },
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98 {
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99 "cell_type": "code",
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100 "execution_count": 3,
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101 "metadata": {
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102 "collapsed": false
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103 },
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104 "outputs": [
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105 {
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106 "name": "stderr",
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107 "output_type": "stream",
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108 "text": [
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109 "/var/folders/31/qct57s856n5f0b2r4tgbmn1c0000gn/T/tmpw4Kz3c.c:2:5: warning: implicitly declaring library function 'printf' with type 'int (const char *, ...)' [-Wimplicit-function-declaration]\n",
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110 " printf(\"Hello world\")\n",
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111 " ^\n",
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112 "/var/folders/31/qct57s856n5f0b2r4tgbmn1c0000gn/T/tmpw4Kz3c.c:2:5: note: include the header <stdio.h> or explicitly provide a declaration for 'printf'\n",
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113 "/var/folders/31/qct57s856n5f0b2r4tgbmn1c0000gn/T/tmpw4Kz3c.c:2:26: error: expected ';' after expression\n",
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114 " printf(\"Hello world\")\n",
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115 " ^\n",
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116 " ;\n",
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117 "1 warning and 1 error generated.\n",
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118 "[C kernel] GCC exited with code 1, the executable will not be executed"
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119 ]
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120 },
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121 {
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122 "name": "stdout",
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123 "output_type": "stream",
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124 "text": []
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125 }
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126 ],
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127 "source": [
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128 "int main() {\n",
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129 " printf(\"Hello world\")\n",
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130 "}"
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131 ]
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132 },
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133 {
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134 "cell_type": "markdown",
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135 "metadata": {},
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136 "source": [
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137 "You can see that the errors and warnings are shown, but the code is not executed. The retcode is also added to the end of `stderr`"
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138 ]
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139 }
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140 ],
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141 "metadata": {
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142 "kernelspec": {
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143 "display_name": "C",
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144 "language": "c",
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145 "name": "c_kernel"
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146 },
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147 "language_info": {
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148 "file_extension": "c",
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149 "mimetype": "text/plain",
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150 "name": "c"
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151 }
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152 },
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153 "nbformat": 4,
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154 "nbformat_minor": 0
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155 }
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