3.1 limits.cpp

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。