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annotate actions.c @ 53:036779d5da75

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"sum" node clears its value now everytime it gets called
author meillo@marmaro.de
date Sun, 02 Mar 2008 16:32:52 +0100
parents 201b4603671a
children 6279e5b14d9e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include "baum.h"
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5
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6 unsigned char action_print(struct Node* node);
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7 unsigned char action_sum(struct Node* node);
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8 unsigned char action_number(struct Node* node);
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9 unsigned char action_create(struct Node* node);
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10 unsigned char action_times(struct Node* node);
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11 unsigned char action_if(struct Node* node);
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12 unsigned char action_while(struct Node* node);
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16 unsigned char action(struct Node* node) {
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17 if (node == NULL) {
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18 if (option_verbose) {
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19 fprintf(stderr, "warning: action of non existing node\n");
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20 }
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21 return 0;
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22 }
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23
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24 if (strcmp(node->name, "print") == 0) {
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25 return action_print(node);
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27 } else if (strcmp(node->name, "sum") == 0) {
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28 return action_sum(node);
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30 } else if (strcmp(node->name, "number") == 0) {
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31 return action_number(node);
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33 } else if (strcmp(node->name, "create") == 0) {
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34 return action_create(node);
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36 } else if (strcmp(node->name, "times") == 0) {
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37 return action_times(node);
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39 } else if (strcmp(node->name, "if") == 0) {
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40 return action_if(node);
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41
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42 } else if (strcmp(node->name, "while") == 0) {
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43 return action_while(node);
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45 } else {
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46 fprintf(stderr, "unknown kind of node\n");
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47 exit(4);
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48 }
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49 }
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53 unsigned char action_print(struct Node* node) {
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54 unsigned char result;
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55 result = action(node->down);
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56 if (node->value == 'c') {
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57 printf("%c", result);
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58 } else {
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59 printf("%d", result);
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60 }
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61 return result;
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62 }
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64
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65 unsigned char action_sum(struct Node* node) {
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66 struct Node* tp;
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67
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68 node->value = 0;
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69 tp = node->down;
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70 while (tp != NULL) {
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71 node->value += action(tp);
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72 tp = tp->right;
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73 }
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74 return node->value;
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75 }
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77
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78 unsigned char action_number(struct Node* node) {
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79 if (node->down != NULL) {
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80 action(node->down);
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81 }
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82 return node->value;
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83 }
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84
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85
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86 unsigned char action_create(struct Node* node) {
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87 int input;
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88
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89 if (node->down == NULL) {
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90 /* user input */
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91 printf("input: ");
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92 scanf("%d", &input);
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93 input = input % 256;
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94 } else {
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95 /* return value */
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96 input = action(node->down);
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97 }
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98 insertLast(node, newNode("number", (char) input));
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99 return 0;
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100 }
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101
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102
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103 unsigned char action_times(struct Node* node) {
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104 unsigned char i;
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105 for (i = 0; i < node->value; i++) {
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106 insertLast(node, copyTree(node->down));
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107 }
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108 return 0;
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109 }
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110
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111
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112 unsigned char action_if(struct Node* node) {
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113 int result = 0;
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114 char return1;
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115 char return2;
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116
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117 if (node->down == NULL || node->down->right == NULL) {
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118 fprintf(stderr, "error: while requires two sons");
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119 exit(7);
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120 }
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121
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122 return1 = action(node->down);
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123 return2 = action(node->down->right);
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124
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125 if (node->value == '!') { /* 33 */
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126 if (return1 != return2) {
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127 result = 1;
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128 }
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129 } else if (node->value == '<') { /* 60 */
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130 if (return1 < return2) {
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131 result = 1;
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132 }
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133 } else if (node->value == '>') { /* 62 */
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134 if (return1 > return2) {
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135 result = 1;
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136 }
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137 } else {
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138 if (return1 == return2) {
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139 result = 1;
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140 }
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141 }
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142 return result;
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143 }
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144
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145
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146 unsigned char action_while(struct Node* node) {
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147 if (node->down == NULL || node->down->right == NULL) {
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148 fprintf(stderr, "error: while requires two sons");
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149 exit(7);
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150 }
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151 while (action(node->down)) {
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152 action(node->down->right);
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153 }
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154 return 0;
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155 }