Exemple du cours

2026-10-07 00:07:20 +02:00
parent 6c6f358095
commit 0a0c3a518f
1 changed files with 32 additions and 0 deletions
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 #include <stdio.h>
 int est_premier(int n) {
    if (n < 2) return 0;
    for (int d = 2; d < n; d++)
        if (n % d == 0) return 0;
    return 1;
 }
 int somme_chiffres(int n) {
    int s = 0;
    for (; n > 0; n /= 10) s += n % 10;
    return s;
 }
 int compter_premiers(int limite) {
    int total = 0;
    for (int i = 0; i < limite; i++)
        if (est_premier(i)) total++;
    return total;
 }
 int premiers_chanceux(int limite) {
    int total = 0;
    for (int i = 0; i < limite; i++)
        if (est_premier(somme_chiffres(i)) && est_premier(i))
            total++;
    return total;
 }
 int main(void) {
    printf("Nombres premiers < 60000       : %d\n", compter_premiers(60000));
    printf("Premiers « chanceux » < 60000  : %d\n", premiers_chanceux(60000));
    return 0;
 }