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3.1 limits.cpp

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目录
  • 3.1 limits.cpp
    • 1 程序清单 3.1
    • 2 注意事项

3.1 limits.cpp

1 程序清单 3.1

  1. limits.cpp

    // limits.cpp -- some integer limits
#include <iostream>
#include <climits>  // use limits.h for older systems

int main()
{
    using namespace std;

    int n_int = INT_MAX;  // initialize n_int to max int value
    short n_short = SHRT_MAX; // symbols defined in climits file
    long n_long = LONG_MAX;
    long long n_llong = LLONG_MAX;

    // sizeof operator yields size of type or of variable
    cout << "int is " << sizeof(int) << " bytes." << endl;
    cout << "short is " << sizeof n_short << " bytes." << endl;
    cout << "long is " << sizeof n_long << " bytes." << endl;
    cout << "long long is " << sizeof n_llong << " bytes." << endl;
    cout << endl;

    cout << "Maximum values:" << endl;
    cout << "int: " << n_int << endl;
    cout << "short: " << n_short << endl;
    cout << "long: " << n_long << endl;
    cout << "long long: " << n_llong << endl;

    cout << "Minimum int value = " << INT_MIN << endl;
    cout << "Bits per byte = " << CHAR_BIT << endl;
    
    cout << "char的位数[CHAR_BIT] : " << CHAR_BIT << endl;
 
    cout << "char的最大值[CHAR_MAX] : " << CHAR_MAX << endl;
    cout << "char的最小值[CHAR_MIN] : " << CHAR_MIN << endl;

    cout << "signed char 最大值[SCHAR_MAX] : " << SCHAR_MAX << endl;
    cout << "signed char 最小值[SCHAR_MIN] : " << SCHAR_MIN << endl;
    cout << "unsigned char 最大值[UCHAR_MAX] : " << UCHAR_MAX << endl;

    cout << "short 最大值[SHRT_MAX] : " << SHRT_MAX << endl;
    cout << "short 最小值[SHRT_MIN] : " << SHRT_MIN << endl;
    cout << "unsigned short 最大值[USHRT_MAX] : " << USHRT_MAX << endl;

    cout << "int 最大值[INT_MAX] : " << INT_MAX << endl;
    cout << "int 最小值[INT_MIN] : " << INT_MIN << endl;
    cout << "unsigned int 最大值[UINT_MAX] : " << UINT_MAX << endl;

    cout << "long 最大值[LONG_MAX] : " << LONG_MAX << endl;
    cout << "long 最小值[LONG_MIN] : " << LONG_MIN << endl;
    cout << "unsigned long 最大值[ULONG_MAX] : " << ULONG_MAX << endl;

    cout << "long long 最大值[LLONG_MAX] : " << LLONG_MAX << endl;
    cout << "long long 最小值[LLONG_MIN] : " << LLONG_MIN << endl;
    cout << "unsigned long long 最大值[ULLONG_MAX] : " << ULLONG_MAX << endl;

    return 0;
}

  2. 运行结果

    int is 4 bytes.
short is 2 bytes.
long is 4 bytes.
long long is 8 bytes.

Maximum values:
int: 2147483647
short: 32767
long: 2147483647
long long: 9223372036854775807
Minimum int value = -2147483648
Bits per byte = 8
char的位数[CHAR_BIT] : 8
char的最大值[CHAR_MAX] : 127
char的最小值[CHAR_MIN] : -128
signed char 最大值[SCHAR_MAX] : 127
signed char 最小值[SCHAR_MIN] : -128
unsigned char 最大值[UCHAR_MAX] : 255
short 最大值[SHRT_MAX] : 32767
short 最小值[SHRT_MIN] : -32768
unsigned short 最大值[USHRT_MAX] : 65535
int 最大值[INT_MAX] : 2147483647
int 最小值[INT_MIN] : -2147483648
unsigned int 最大值[UINT_MAX] : 4294967295
long 最大值[LONG_MAX] : 2147483647
long 最小值[LONG_MIN] : -2147483648
unsigned long 最大值[ULONG_MAX] : 4294967295
long long 最大值[LLONG_MAX] : 9223372036854775807
long long 最小值[LLONG_MIN] : -9223372036854775808
unsigned long long 最大值[ULLONG_MAX] : 18446744073709551615

2 注意事项

  1. 如果您的系统不支持类型long long ，应删除使用该类型的代码行。
  2. 以上结果输出来自运行64位Windows7系统。
  3. 比源代码多部分内容。
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