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- #include <stdio.h>
- #include <stdlib.h>
- #define TRUE 1
- #define FALSE 0
- int main(int argc, char *argv[])
- {
- FILE *in;
- int a, d, n;
- int number;
- if (argc != 2) {
- fprintf(stderr, "usage: %s file\n", argv[0]);
- exit(1);
- }
- if ((in = fopen(argv[1], "r")) == NULL) {
- fprintf(stderr, "cannot open %s\n", argv[0]);
- }
- while (1) {
- fscanf(in, "%d %d %d", &a, &d, &n);
- if (a == 0 && d == 0 && n == 0) {
- break;
- }
- number = a;
- while (n != 0) {
- if (isPrime(number) == TRUE) {
- if (n == 1) {
- printf("%d\n", number);
- break;
- }
- n --;
- }
- number += d;
- }
- }
- }
- int isPrime(int x)
- {
- int i;
- if (x == 1) {
- return FALSE;
- }
- for (i = 2; i < x; i ++) {
- if (x % i == 0) {
- return FALSE;
- }
- }
- return TRUE;
- }
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