diff --git a/solutions/c/difference-of-squares/1/difference_of_squares.c b/solutions/c/difference-of-squares/1/difference_of_squares.c
new file mode 100644
index 0000000..4767ce6
--- /dev/null
+++ b/solutions/c/difference-of-squares/1/difference_of_squares.c
@@ -0,0 +1,50 @@
+#include "difference_of_squares.h"
+
+unsigned int sum_of_squares(unsigned int number)
+ {
+
+         unsigned int i = 1;
+         int multi = 0;
+         int b = 0;
+         while(i <= number)
+                  {
+                          multi = i * i;
+                          b = b + multi;
+                  i++;
+                  }
+ 
+ 
+          return b;
+  }
+  unsigned int square_of_sum(unsigned int number)
+  {
+ 
+          unsigned int i = 1;
+          int sum = 0;
+          int multi = 0;
+                  while(i <= number)
+                          {
+ 
+                                  sum = sum + i;
+                          i++;
+                          }
+                                  multi = sum * sum;
+ 
+ 
+         return multi;
+ 
+  }
+ 
+  unsigned int difference_of_squares(unsigned int number)
+  {
+ 
+           unsigned int sum_squa = 0;
+           unsigned int squa_sum = 0;
+      unsigned int dif = 0;
+ 
+          sum_squa = sum_of_squares(number);
+          squa_sum = square_of_sum(number);
+ 
+                  dif = squa_sum - sum_squa;
+          return dif;
+  }
\ No newline at end of file
diff --git a/solutions/c/difference-of-squares/1/difference_of_squares.h b/solutions/c/difference-of-squares/1/difference_of_squares.h
new file mode 100644
index 0000000..cbb65f2
--- /dev/null
+++ b/solutions/c/difference-of-squares/1/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