Added another solution to the salary problem

vagen_till_c/ch2/exercise4_ver2.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#define GOAL 100*1000000
+/* My solution to exercise 4, chapter 2 from "Vägen till C".
+ * A man is offered a highly dangerous job, with an unusual salary.
+ * First day he'll get 1 cent, second day 2 cents, third day 4 cents and so on.
+ * Write a program to calculate how many days he'll have to work to reach one
+ * million dollar.
+ */
+
+int main()
+{
+    int salary = 1;
+    int days = 1;
+    int tot = 0;
+    
+    while(tot<=GOAL)
+    {
+        salary = salary * 2;
+        tot += salary;
+        days++;
+    }
+    printf("He'll have to work %d days to reach %d dollar\n", days, GOAL/100);
+}