diff --git a/CALCULATOR.c b/CALCULATOR.c
new file mode 100644
index 0000000..b717cce
--- /dev/null
+++ b/CALCULATOR.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <conio.h>
+int main()
+{//declarations
+double num1, num2;
+int op;
+printf("*********WELCOME*********\n");
+printf("1.Addition\n2.Substration\n3.Multiplication\n4.Division\n");
+printf("enter your choice\n");
+scanf("%d",&op);
+printf("Enter first number\n");
+scanf("%lf",&num1);
+printf("Enter second number\n");
+scanf("%lf",&num2);
+switch(op){
+     case 1:
+         printf("=%lf\n", num1+num2);
+         break;
+     case 2:
+         printf("=%lf\n", num1-num2);
+         break;
+     case 3:
+         printf("=%lf\n", num1*num2);
+         break;
+     case 4:
+         if(num2==0)
+             printf("Division by zero error!\n");
+         else
+             printf("=%lf\n", num1/num2);
+         break;
+         default: printf("Invalid Operator\n");
+         }
+return 0;
+}
diff --git a/programs/calculator.c b/programs/calculator.c
new file mode 100644
index 0000000..38658c1
--- /dev/null
+++ b/programs/calculator.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <conio.h>
+int main(){
+ //declarations
+double num1, num2;
+int op;
+printf("*********WELCOME*********\n");
+printf("1.Addition\n2.Substration\n3.Multiplication\n4.Division\n");
+printf("enter your choice\n");
+scanf("%d",&op);
+printf("Enter first number\n");
+scanf("%lf",&num1);
+
+printf("Enter second number\n");
+scanf("%lf",&num2);
+ switch(op){
+     case 1:
+
+         printf("=%lf\n", num1+num2);
+         break;
+     case 2:
+         printf("=%lf\n", num1-num2);
+         break;
+     case 3:
+         printf("=%lf\n", num1*num2);
+         break;
+     case 4:
+         if(num2==0){
+             printf("Division by zero error!\n");
+         }else{
+             printf("=%lf\n", num1/num2);
+        }
+        break;
+
+     default: printf("Invalid Operator\n");
+}
+  return 0;
+}