2 files changed, 27 insertions, 0 deletions
diff --git a/c/difference-of-squares/src/difference_of_squares.c b/c/difference-of-squares/src/difference_of_squares.c
new file mode 100644
index 0000000..0d9b6b2
--- /dev/null
+++ b/c/difference-of-squares/src/difference_of_squares.c
@@ -0,0 +1,19 @@
+#include "difference_of_squares.h"
+
+unsigned int sum_of_squares(unsigned int number) {
+    unsigned int sum = 0;
+    for (unsigned int idx = 1; idx <= number; idx++)
+        sum += (idx * idx);
+    return sum;
+}
+
+unsigned int square_of_sum(unsigned int number) {
+    unsigned int sum = 0;
+    for (unsigned int idx = 1; idx <= number; idx++)
+        sum += idx;
+    return sum * sum;
+}
+
+unsigned int difference_of_squares(unsigned int number) {
+    return square_of_sum(number) - sum_of_squares(number);
+}
diff --git a/c/difference-of-squares/src/difference_of_squares.h b/c/difference-of-squares/src/difference_of_squares.h
new file mode 100644
index 0000000..cbb65f2
--- /dev/null
+++ b/c/difference-of-squares/src/difference_of_squares.h
@@ -0,0 +1,8 @@
+#ifndef DIFFERENCE_OF_SQUARES_H
+#define DIFFERENCE_OF_SQUARES_H
+
+unsigned int sum_of_squares(unsigned int number);
+unsigned int square_of_sum(unsigned int number);
+unsigned int difference_of_squares(unsigned int number);
+
+#endif