[TestMethod1]
na=12
nb=4
nExpect=16
[TestMethod2]
na=3
nb=7
nExpect=10
[TestMethod3]
na=2147483647
nb=10
nExpect=2147483657
[TestMethod4]
na=2147483647
nb=1000
nExpect=2147484647
[TestMethod5]
na=2147483647
nb=10000
nExpect=2147493647