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- #include<stdio.h>
- int random(int start, int end) {
- return rand() % (end - start) + start;
- }
- int is_prime(int number) {
- for (int i = 2; i <= number / 2; i++) {
- if (number %i == 0) {
- return 0;
- }
- }
- return 1;
- }
- int nearest_prime(int number) {
- for (int i = 0; i <= number; i++) {
- if (is_prime(number - i)) {
- return number - i;
- }
- }
- return 0;
- }
- int next_prime(int number) {
- for (int i = 0; i <= number; i++) {
- if (is_prime(number + i)) {
- return number + i;
- }
- }
- return 0;
- }
- int main() {
- for (int i = 0; i < 100; ) {
- int r = random(50, 100);
- i++;
- printf("%d + %d - %d\n", r, next_prime(r), nearest_prime(r));
- }
- getchar();
- }
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