74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/* seqit.c: Print a sequence of numbers */
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#include "list.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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/* Functions */
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void usage(int status) {
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fprintf(stderr, "Usage: seqit LAST\n");
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fprintf(stderr, " seqit FIRST LAST\n");
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fprintf(stderr, " seqit FIRST INCREMENT LAST\n");
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exit(status);
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}
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List *generate_sequence(ssize_t first, ssize_t increment, ssize_t last) {
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List* sequence = list_create();
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ssize_t current = first;
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if (increment > 0) {
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while (current <= last) {
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list_append(sequence, (Value){.number = current});
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current += increment;
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}
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} else {
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while (current >= last) {
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list_append(sequence, (Value){.number = current});
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current += increment;
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}
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}
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return sequence;
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}
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/* Main Execution */
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int main(int argc, char *argv[]) {
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// TODO: Parse command line arguments
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ssize_t first = 1, increment = 1, last = 1; // Set initial values
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switch (argc) {
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case 2:
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last = atoll(argv[1]);
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break;
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case 3:
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first = atoll(argv[1]);
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last = atoll(argv[2]);
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break;
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case 4:
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first = atoll(argv[1]);
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increment = atoll(argv[2]);
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last = atoll(argv[3]);
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break;
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default:
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usage(EXIT_FAILURE);
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}
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// TODO: Generate sequence
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List *sequence = generate_sequence(first, increment, last);
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// TODO: Print out sequence
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while (sequence->size > 0) {
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Value v = list_pop(sequence, 0);
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printf("%ld\n", v.number);
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}
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// Delete the list
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list_delete(sequence, false);
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return EXIT_SUCCESS;
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}
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/* vim: set sts=4 sw=4 ts=8 expandtab ft=c: */
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