diff --git a/exercises/calculator.c b/exercises/calculator.c
new file mode 100644
index 0000000..274f707
--- /dev/null
+++ b/exercises/calculator.c
@@ -0,0 +1,31 @@
+/*
+  Write a program that given two numbers as input make the main operations.
+
+  Output:
+  Insert first number: 4
+  Insert second number: 2
+
+  SUM: 6
+  Difference: 2
+  Multiplication: 8
+  Division: 2
+*/
+#include <stdio.h>
+void my_scanf_d(int *x){
+  scanf("%d",x);
+  return;
+}
+
+
+int main(){
+  int a=0,b=0;
+  printf("insert one number\n");
+  my_scanf_d(&a);
+  printf("insert one other number\n");
+  my_scanf_d(&b);
+  printf("SUM:%d\n",a+b);
+  printf("Difference:%d\n",a-b);
+  printf("Moltiplication:%d\n",a*b);
+  printf("Division: %f\n",(float)a/(float)b);
+  return 0;
+}
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