Before function calls:
a= 5  b= 10
At end of badswap, before return:
x= 10  y= 5
After call to badswap:
a= 5  b= 10
At end of goodswap, before return:
x= 10  y= 5
After call to goodswap:
a= 10  b= 5
At end of badswap, before return:
x= 50  y= 2
Before float function calls:
p= 3.14  q= 2.7
At end of goodswap for floats,before return:
x= 2.7  y= 3.14
After call to float goodswap:
p= 2.7  q= 3.14
At end of badswap, before return:
x= 3  y= 2