user-0 提问: c语言

回复:
user: user-1
content: 3/5返回的是整数 3/5.0返回的是double类型

user: user-2
content: 3/5是0，只输出整数部分。 3/5.0有一个是浮点数，才输出小数部分

user: user-3
content: 完全可以问百度和google呀

user: user-4
content: int /int = int   int / double = double

user: user-5
content: 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 );

user: user-5
content: 常量也有类型： C++ Integer Constants Integer constants are constant data elements that have no fractional parts or exponents. They always begin with a digit. You can specify integer constants in decimal, octal, or hexadecimal form. They can specify signed or unsigned types and long or short types.  Syntax  integer-constant :  decimal-constant integer-suffixopt octal-constant integer-suffixopt hexadecimal-constant integer-suffixopt 'c-char-sequence'  decimal-constant :  nonzero-digit decimal-constant digit  octal-constant :  0 octal-constant octal-digit  hexadecimal-constant :  0x hexadecimal-digit 0X hexadecimal-digit hexadecimal-constant hexadecimal-digit  nonzero-digit : one of  1 2 3 4 5 6 7 8 9  octal-digit : one of  0 1 2 3 4 5 6 7  hexadecimal-digit : one of  0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F  integer-suffix :  unsigned-suffix long-suffixopt long-suffix unsigned-suffixopt  unsigned-suffix : one of  u U  long-suffix : one of  l L  64-bit integer-suffix :  i64  To specify integer constants using octal or hexadecimal notation, use a prefix that denotes the base. To specify an integer constant of a given integral type, use a suffix that denotes the type.  To specify a decimal constant, begin the specification with a nonzero digit. For example:  int i = 157;   // Decimal constant int j = 0198;  // Not a decimal number; erroneous octal constant int k = 0365;  // Leading zero specifies octal constant, not decimal  To specify an octal constant, begin the specification with 0, followed by a sequence of digits in the range 0 through 7. The digits 8 and 9 are errors in specifying an octal constant. For example:  int i = 0377;   // Octal constant int j = 0397;   // Error: 9 is not an octal digit  To specify a hexadecimal constant, begin the specification with 0x or 0X (the case of the “x” does not matter), followed by a sequence of digits in the range 0 through 9 and a (or A) through f (or F). Hexadecimal digits a (or A) through f (or F) represent values in the range 10 through 15. For example:  int i = 0x3fff;   // Hexadecimal constant int j = 0X3FFF;   // Equal to i  To specify an unsigned type, use either the u or U suffix. To specify a long type, use either the l or L suffix. For example:  unsigned uVal = 328u;             // Unsigned value long lVal = 0x7FFFFFL;            // Long value specified                                    //  as hex constant unsigned long ulVal = 0776745ul;  // Unsigned long value

user: user-6
content: 整数和小数区别

user: user-7
content: 区别是一个是整数除法，一个是实数除法； 整数除法得到的值是整数，实数除法得到的是实数；

user: user-8
content: 前面一个也可以称为整除（即除了之后的值只取整数部分，小数部分舍弃），而后面一个涉及到了数据类型的隐式转换（数据类型的转换分为显示转换也叫强制类型转换，和隐式转换），隐式转换中数据类型会由低级向高级转换（此处表现为一个整数和一个浮点数相除，结果会自动向高级的浮点数转换），因此后一个的结果是一个浮点数（即使是10/5.0时结果会显示为2，但只是省略了后面的小数为0的部分没显示，实际上还是浮点数的类型）。 以上属于我个人理解，仅供参考，如有不当之处请指出，谢谢~

user: user-9
content: 前者是整数除法，结果为0（商0）  后者3会隐式转换double，进行浮点数除法，结果为double类型的0.6

user: user-10
content: 得到的结果是整数 和 小数