okada@hazel[1]_% gcc -o prac2-5 prac2-5.c -lm
okada@hazel[2]_% prac2-5
  0  -17.8
 20   -6.7
 40    4.4
 60   15.6
 80   26.7
100   37.8
120   48.9
140   60.0
160   71.1
180   82.2
200   93.3
okada@hazel[3]_%