diff --git a/exercises/binary_converter.cpp b/exercises/binary_converter.cpp
index 19bf37dd..448cdc18 100644
--- a/exercises/binary_converter.cpp
+++ b/exercises/binary_converter.cpp
@@ -5,3 +5,35 @@
   Insert first number: 8
   The binary number is: 1000
 */
+#include <stdio.h>
+
+void decToBinary(int n) {
+    if (n == 0) {
+        printf("0");
+        return;
+    }
+
+    int binary[32];
+    int i = 0;
+
+    while (n > 0) {
+        binary[i] = n % 2;
+        n = n / 2;
+        i++;
+    }
+
+    for (int j = i - 1; j >= 0; j--)
+        printf("%d", binary[j]);
+}
+
+int main() {
+    int num;
+    printf("Insert first number: \n");
+    scanf("%d", &num);
+
+    printf("The binary number is: \n");
+    decToBinary(num);
+    printf("\n");
+
+    return 0;
+}
\ No newline at end of file
diff --git a/exercises/calculator.cpp b/exercises/calculator.cpp
index 013cc786..0245930e 100644
--- a/exercises/calculator.cpp
+++ b/exercises/calculator.cpp
@@ -10,3 +10,25 @@
   Multiplication: 8
   Division: 2
 */
+#include <stdio.h>
+
+int main() {
+    float num1, num2;
+
+    printf("Insert first number: ");
+    scanf("%f", &num1);
+
+    printf("Insert second number: ");
+    scanf("%f", &num2);
+
+    printf("\nSUM: %.2f", num1 + num2);
+    printf("\nDifference: %.2f", num1 - num2);
+    printf("\nMultiplication: %.2f", num1 * num2);
+
+    if (num2 != 0)
+        printf("\nDivision: %.2f\n", num1 / num2);
+    else
+        printf("\nDivision: impossible (division by zero)\n");
+
+    return 0;
+}