diff --git a/src/main/c/Calculator/calculator.c b/src/main/c/Calculator/calculator.c
index b46882a..a5d66a4 100644
--- a/src/main/c/Calculator/calculator.c
+++ b/src/main/c/Calculator/calculator.c
@@ -6,6 +6,11 @@ int add(int num1, int num2);
 int subtract(int num1, int num2);
 int multiply(int num1, int num2);
 int divide(int num1, int num2);
+double exponent(double base, double exponent);
+double modulus(double num1, double num2);
+double logarithm(double num);
+double potential(double base, double exponent);
+double squareRoot(double num);
 
 int main() {
     int choice, num1, num2, result;