立此存照(10)[C++]climits头文件以及5中基本类型的长度与极值

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使用climits C++标准头文件可以获取char, short, int, long, long long 等5中基本类型的最大值和最小值

1.编译环境:VS2008

#include <iostream>#include <iomanip>//needs setw#include <climits>using std::cout;using std::endl;using std::setw;using std::ios;int main(){const int COUT_WIDTH = 25;//charcout<<"sizeof(char):"<<sizeof(char)<<endl;cout<<setw(COUT_WIDTH)<<setiosflags(ios::left)<<"char Min:"<<CHAR_MIN<<endl;cout<<setw(COUT_WIDTH)<<"char Max:"<<CHAR_MAX<<endl;cout<<setw(COUT_WIDTH)<<"signed char Min:"<<SCHAR_MIN<<endl;cout<<setw(COUT_WIDTH)<<"signed char Max:"<<SCHAR_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned char Max:"<<UCHAR_MAX<<endl<<endl;//shortcout<<"sizeof(short):"<<sizeof(short)<<endl;cout<<setw(COUT_WIDTH)<<"short Min:"<<SHRT_MIN<<endl;cout<<setw(COUT_WIDTH)<<"short Max:"<<SHRT_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned short Max:"<<USHRT_MAX<<endl<<endl;//intcout<<"sizeof(int):"<<sizeof(int)<<endl;cout<<setw(COUT_WIDTH)<<"int Min:"<<INT_MIN<<endl;cout<<setw(COUT_WIDTH)<<"int Max:"<<INT_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned int Max:"<<UINT_MAX<<endl<<endl;//longcout<<"sizeof(long):"<<sizeof(long)<<endl;cout<<setw(COUT_WIDTH)<<"long Min:"<<LONG_MIN<<endl;cout<<setw(COUT_WIDTH)<<"long Max:"<<LONG_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned long Max:"<<ULONG_MAX<<endl<<endl;//long longcout<<"sizeof(long long):"<<sizeof(long long)<<endl;cout<<setw(COUT_WIDTH)<<"long long Min:"<<LLONG_MIN<<endl;cout<<setw(COUT_WIDTH)<<"long long Max:"<<LLONG_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned long long Max:"<<ULLONG_MAX<<endl;return 0;}

执行结果:

编译环境:G++

2.编译环境:VC++6.0

#include <iostream>#include <iomanip>//needs setw#include <climits>using std::cout;using std::endl;using std::setw;using std::ios;int main(){const int COUT_WIDTH = 25;//charcout<<"sizeof(char):"<<sizeof(char)<<endl;cout.setf(ios::left);//cout<<setiosflags(ios::left);这样设置对齐方式行不通cout<<setw(COUT_WIDTH)<<"char Min:"<<CHAR_MIN<<endl;cout<<setw(COUT_WIDTH)<<"char Max:"<<CHAR_MAX<<endl;cout<<setw(COUT_WIDTH)<<"signed char Min:"<<SCHAR_MIN<<endl;cout<<setw(COUT_WIDTH)<<"signed char Max:"<<SCHAR_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned char Max:"<<UCHAR_MAX<<endl<<endl;//shortcout<<"sizeof(short):"<<sizeof(short)<<endl;cout<<setw(COUT_WIDTH)<<"short Min:"<<SHRT_MIN<<endl;cout<<setw(COUT_WIDTH)<<"short Max:"<<SHRT_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned short Max:"<<USHRT_MAX<<endl<<endl;//intcout<<"sizeof(int):"<<sizeof(int)<<endl;cout<<setw(COUT_WIDTH)<<"int Min:"<<INT_MIN<<endl;cout<<setw(COUT_WIDTH)<<"int Max:"<<INT_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned int Max:"<<UINT_MAX<<endl<<endl;//longcout<<"sizeof(long):"<<sizeof(long)<<endl;cout<<setw(COUT_WIDTH)<<"long Min:"<<LONG_MIN<<endl;cout<<setw(COUT_WIDTH)<<"long Max:"<<LONG_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned long Max:"<<ULONG_MAX<<endl<<endl;/*//long long 不支持long long类型cout<<"sizeof(long long):"<<sizeof(long long)<<endl;cout<<setw(COUT_WIDTH)<<"long long Min:"<<LLONG_MIN<<endl;cout<<setw(COUT_WIDTH)<<"long long Max:"<<LLONG_MAX<<endl;cout<<setw(COUT_WIDTH)<<"unsigned long long Max:"<<ULLONG_MAX<<endl;*/return 0;}

执行结果:

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