limits.h

limits.h

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看别人代码突然发现还有climits（limits.h）这么个头文件，以后初始化最大值最小值什么的就方便多

符号常量 表示
CHAR_BIT char 的位数
CHAR_MAX char 的最大值
CHAR_MIN char 的最小值
SCHAR_MAX signed char 的最大值
SCHAR_MIN signed char 的最小值
UCHAR_MAX unsigned char 的最大值
SHRT_MAX short 的最大值
SHRT_MIN short 的最小值
USHRT_MAX unsigned short 的最大值
INT_MAX int 的最大值
INT_MIN int 的最小值
UNIT_MAX unsigned int 的最大值
LONG_MAX long 的最大值
LONG_MIN long 的最小值
LONG_MAX unsigned long 的最大值

表 3.1 climits中的符号常量


#include <iostream>
#include <climits>
using namespace std;
int main()
{
    cout << "Size:" << endl;
    cout << "int is     "   << sizeof (int)     << "bytes." << endl;
    cout << "short is   "   << sizeof (short)   << "bytes." << endl;
    cout << "long is    "   << sizeof (long)    << "bytes." << endl << endl;

    cout << "Bits per byte = " << CHAR_BIT << endl << endl;

    cout << "Maximum values:" << endl;
    cout << "int:           "   << INT_MAX << endl;
    cout << "short:         "   << SHRT_MAX << endl;
    cout << "long:          "   << LONG_MAX << endl;
    cout << "char:          "   << CHAR_MAX << endl;
    cout << "signed char:   "   << SCHAR_MAX << endl;
    cout << "unsigned int:  "   << UINT_MAX << endl;
    cout << "unsigned short:"   << USHRT_MAX << endl;
    cout << "unsigned long: "   << ULONG_MAX << endl;
    cout << "unsigned char: "   << UCHAR_MAX << endl << endl;

    cout << "Minimum values:" << endl;
    cout << "int:           "   << INT_MIN << endl;
    cout << "short:         "   << SHRT_MIN << endl;
    cout << "long:          "   << LONG_MIN <<endl;
    cout << "char:          "   << CHAR_MIN <<endl;
    cout << "signed char:   "   << SCHAR_MIN  <<endl;

    system("pause");

    return 0;
}

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