ex15 16 finis

# Exercice 15
mafonction = function(x,y)
{
  if (y<0)
  {
    y=0
  }
  z = x + log(y)
  z
}
print(mafonction(3,-5))
# Exercice 16
a = c(1:3)
b = c(2:4)
print(a)
print(a+5)
print(b)
print(b-a)
print(a*b)
print(a/b)
print(b**2)
print(b%%3)
print(a**b)