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- #include<stdio.h>
- void main(void){
- int nbre;
- printf("Enter a positive integer: ");
- scanf("%d", &nbre);
- while (nbre != -1){
- int i = 2;
- while (nbre > 3 && i <= nbre / 2 && nbre % i != 0){
- i++;
- }
- if (i > nbre / 2)
- printf("c'est un nombre premier.\n");
- else
- printf("ce n'est pas un nombre premier.\n");
- printf("Enter a positive integer: ");
- scanf("%d", &nbre);
- }
- }
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