Merge pull request #3558 from fegorama/reto21_c

Reto #21 - C
mouredev · May 24, 2023 · ce3b003 · ce3b003
2 parents 4e115f0 + 75f2d0f
commit ce3b003
Showing 1 changed file with 52 additions and 0 deletions.
diff --git a/Retos/Reto #21 - NÚMEROS PRIMOS GEMELOS [Media]/c/fegorama.c b/Retos/Reto #21 - NÚMEROS PRIMOS GEMELOS [Media]/c/fegorama.c
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int isPrime(int n) 
+{
+    if (n < 3 || n == 4)
+    {
+        return 0;
+    }
+
+    int max = n / 2;
+
+    for (int i=2; i < max; i++)
+    {
+        if (n % i == 0)
+            return 0;
+    }
+
+    return 1;
+}
+
+int main(int args, char** argv)
+{
+    int rg, diff, ant = 0;
+
+    if (args != 2) 
+    {
+        printf("Debe introducir el rango máximo.");
+        return 1;
+    }
+
+    rg = atoi(argv[1]);
+
+    if (rg > 4) {
+        printf("(3, 5)");
+    } else 
+        return 0;
+
+    for (int i=4; i <= rg; i++) {
+        if (isPrime(i)) {
+            diff = i - ant;
+
+            if (diff == 2) {
+                printf(", (%d, %d)", ant, i);                
+            }
+
+            ant = i;
+        }
+    }
+
+    return 0;
+}