Lesson 8.

08/Optional02.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+int sumSquares(int num) {
+    if (num == 1) {
+        return 1;
+    }
+    else {
+        return num*num + sumSquares(num - 1);
+    }
+}
+
+int sumSum(int k) {
+    if (k == 1) {
+        return 1;
+    }
+    else {
+        return k*sumSquares(k) + sumSum(k - 1);
+    }
+}
+
+int main() {
+    int S, NS;
+    int n = 50;
+    S = sumSum(n);
+    NS = n*(n+1)/2*(n+2)/3*(8*n*n+11*n + 1)/20;
+    if (S > NS) {
+        printf("1");
+    }
+    else if (S == NS) {
+        printf("0");
+    }
+    else {
+        printf("-1");
+    }
+    return 0;
+}