比例应为浮点型变量（或常量）。
浮点型数字和长变量类型的定义是有差异的。
There are differences in the definition of floating-point Numbers and long variable types.
支持的变量包括整型、浮点型的数字、字符串、数组和对象。
Supported variables include integers, floating point Numbers, strings, arrays, and objects.
如果你需要在程序中存储浮点数，必须将变量类型声明为double，就像上面你写add2integers这个程序需要将变量声明为int型一样。
If you need to store floating-point values in a program, you must declare variables of type double, just as you previously had to declare variables of type int to write Add2Integers.
当一个浮点型数据赋值给整型变量时会发生？
What happen when a floating point value is assigned to an integer variable?
PAT和EFAT能接受多种数据类型，包括整型、布尔型、浮点型、枚举型变量和有限大小的数组。
PAT and EFAT accept several data types, such as integers, Booleans, floats, enumerates and fixed-size arrays.
PAT和EFAT能接受多种数据类型，包括整型、布尔型、浮点型、枚举型变量和有限大小的数组。
PAT and EFAT accept several data types, such as integers, Booleans, floats, enumerates and fixed-size arrays.
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