x=0, val=0, now x=0
x=0, val=1, now x=1
x=0, val=2, now x=2
x=0, val=3, now x=3
x=0, val=4, now x=4
x=0, val=5, now x=5
x=0, val=6, now x=6
x=0, val=7, now x=7
x=0, val=8, now x=8
x=0, val=9, now x=9


now where x is a static variable

x=0, val=0, now x=0
x=0, val=1, now x=1
x=1, val=2, now x=3
x=3, val=3, now x=6
x=6, val=4, now x=10
x=10, val=5, now x=15
x=15, val=6, now x=21
x=21, val=7, now x=28
x=28, val=8, now x=36
x=36, val=9, now x=45