3

solutions/sharafat/10/3.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <math.h>
+
+int factorial(int n)
+{
+    if (n == 1)
+        return 1;
+    else
+        return n * factorial(n - 1);
+}
+
+float evaluate(int x, int n, int i)
+{
+    if (n >= 10)
+        return 0;
+    else if (i % 2 == 0)
+        return -pow(x, n) / factorial(n) + evaluate(x, n + 2, i+1);
+    else
+        return pow(x, n) / factorial(n) + evaluate(x, n + 2, i+1);
+}
+
+int main()
+{
+    int n;
+    scanf("%d", &n);
+    printf("%f\n", evaluate(n, 1, 1));
+}