第
四
章
顺
序
结
构
程
序
设
计
例: Dim A As Integer, B As Single
Dim C As Double, S As String
A = 100 ' 将整型数100赋给整型变量A
S = "123.45" ' 将字符串"123.45"赋给变量S
A = S ' 将数字字符串变量赋给整型变量，
' 变量A中存放123
S = A ' S中存放字符串"123"
B = 12345.67
A = B ‘ 高单度变量赋值给整型变量，
' 先四舍五入后取整, A中存放12346
C = 123456.789
B = C ' 高精度变量赋值给低精度变量，
' 变量B中存放123456.8。有效数字7位
S = "abc"
A = S ' 错误，类型不匹配
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