Sams Teach Yourself C in 21 Days

Pointers: Beyond the Basics 429

115: if (new_rec->next_rec != prev_rec->next_rec) 15

116: {

117: printf(“ERROR”);

118: getc(stdin);

119: exit(0);

120: }

121: prev_rec->next_rec = new_rec;

122: break; /* link is added; exit while */

123: }

124: else

125: {

126: tmp_rec = tmp_rec->next_rec;

127: prev_rec = prev_rec->next_rec;

128: }

129: }

130:

131: /* check to see if adding to the end */

132: if (tmp_rec->next_rec == NULL)

133: {

134: if (new_rec->ch < tmp_rec->ch ) /* 1 b4 end */

135: {

136: new_rec->next_rec = tmp_rec;

137: prev_rec->next_rec = new_rec;

138: }

139: else /* at the end */

140: {

141: tmp_rec->next_rec = new_rec;

142: new_rec->next_rec = NULL; /* redundant */

143: }

144: }

145: }

146: }

147: }

148: return(first);

149: }

150:

151: /*========================================================*

152: * Function: show_list

153: * Purpose : Displays the information current in the list

154: *========================================================*/

155:

156: void show_list( LISTPTR first )

157: {

158: LISTPTR cur_ptr;

159: int counter = 1;

160:

161: printf(“\n\nRec addr Position Data Next Rec addr\n”);

162: printf(“======== ======== ==== =============\n”);

163:

LISTING15.13 continued

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