calculator.c

functional_market/Fundamentals/calculator.c

@@ -1,9 +1,32 @@
 #include "calculator.h"
 
+int add(int a, int b){ return a + b;}
+int sub(int a, int b){ return a - b;}
+int mul(int a, int b){return a * b;}
+int div(int a, int b){return a / b;}
+int mod(int a, int b){return a % b;}
+
+
 int calculator(int a, int b, enum operation op)
 {
-    (void)a;
-    (void)b;
-    (void)op;
-    return 0;
+    const operator lookup_table_name[] = {
+
+        [ADD] = &add,
+        [SUB] = &sub,
+        [MUL] = &mul,
+        [DIV] = &div,
+        [MOD] = &mod,
+    };
+
+    return lookup_table_name[op](a, b);
 }
+/*
+#include <stdio.h>
+int main(void)
+{
+    int a = 144;
+    int b = 10;
+    enum operation op = MOD;
+    printf("calculator(%d, %d, %d) = %d\n", a, b, op, calculator(a, b, op));
+}
+*/