请问C语言中如果a是浮点型，那么if语句中如何判断大小啊？例如：如果100

[weixin_44612285]

新手求问
是一定要用fabs（a）吗？？？

[「已注销」]

首先fabs是浮点数的求绝对值函数，和你的需求应该没多大关系 然后浮点型和整型比较的时候，会进行隐式类型转换，直接就可以比较 最后100<a&&a<233

[赵4老师]

100.0f<a&&a<233.0f 常量也有类型！ C++ Floating-Point Constants Floating-point constants specify values that must have a fractional part. These values contain decimal points (.) and can contain exponents. Syntax floating-constant : fractional-constant exponent-partopt floating-suffixopt digit-sequence exponent-part floating-suffixopt fractional-constant : digit-sequenceopt . digit-sequence digit-sequence . exponent-part : e signopt digit-sequence E signopt digit-sequence sign : one of + – digit-sequence : digit digit-sequence digit floating-suffix :one of f l F L Floating-point constants have a “mantissa,” which specifies the value of the number, an “exponent,” which specifies the magnitude of the number, and an optional suffix that specifies the constant’s type. The mantissa is specified as a sequence of digits followed by a period, followed by an optional sequence of digits representing the fractional part of the number. For example: 18.46 38. The exponent, if present, specifies the magnitude of the number as a power of 10, as shown in the following example: 18.46e0 // 18.46 18.46e1 // 184.6 If an exponent is present, the trailing decimal point is unnecessary in whole numbers such as 18E0. Floating-point constants default to type double. By using the suffixes f or l (or F or L — the suffix is not case sensitive), the constant can be specified as float or long double, respectively. Although long double and double have the same representation, they are not the same type. For example, you can have overloaded functions like void func( double ); and void func( long double );