各种数据类型的最大/小值的常量

#include<bits/stdc++.h>
using namespace std;
int main()
{
	
	cout<<INT_MAX<<endl; 
                       //2147483647............2^31-1
                       cout<<INT_MIN<<endl;
                     //-2147483648
	cout<<LLONG_MAX<<endl;
	//9223372036854775807.........2^63-1
	cout<<LLONG_MIN<<endl;
	//-9223372036854775808
	cout<<ULLONG_MAX<<endl;
	//18446744073709551615............2^64-1
	
}

　　

 

#include<bits/stdc++.h>
using namespace std;
void print(__int128 x) 
{
    if(x<0) putchar('-'),x=-x;
    if(!x) return ;print(x/10),putchar(x%10+48);
}
int main()
{
	__int128 ans=1;
	for(int i=1;i<=126;i++)
	{
		ans=ans*2;
		cout<<i<<" ";
		print(ans);
		cout<<endl;
		
	}
	print(ans*2-1);
}

　　

 

 

#include<iostream>
#include<string>
#include <limits>
using namespace std;
int main()
{
    cout << "type: \t\t\t" << "************size**************"<< endl;
    cout << "short: \t\t\t" << "字节数：" << sizeof(short) <<endl;
    cout << "最大值：" << (numeric_limits<short>::max)();
    cout << "\t\t最小值：" << (numeric_limits<short>::min)() << endl;
    cout << "int: \t\t\t" << "字节数：" << sizeof(int) <<endl;
    cout << "最大值：" << (numeric_limits<int>::max)();
    cout << "\t最小值：" << (numeric_limits<int>::min)() << endl;
    cout << "unsigned: \t\t" << "字节数：" << sizeof(unsigned) <<endl;
    cout << "最大值：" << (numeric_limits<unsigned>::max)();
    cout << "\t最小值：" << (numeric_limits<unsigned>::min)() << endl;
    cout << "long: \t\t\t" << "字节数：" << sizeof(long) <<endl;
    cout << "最大值：" << (numeric_limits<long>::max)();
    cout << "\t最小值：" << (numeric_limits<long>::min)() << endl;
    cout << "unsigned long: \t\t" << "字节数：" << sizeof(unsigned long) <<endl;
    cout << "最大值：" << (numeric_limits<unsigned long>::max)();
    cout << "\t最小值：" << (numeric_limits<unsigned long>::min)() << endl;
	cout << "long long: \t\t" << "字节数：" << sizeof(long long) <<endl;
    cout << "最大值：" << (numeric_limits<long long>::max)();
    cout << "\t\t最小值：" << (numeric_limits<long long>::min)() << endl;
	cout << "unsigned long long: \t" << "字节数：" << sizeof(unsigned long long) <<endl;
    cout << "最大值：" << (numeric_limits<unsigned long long>::max)();
    cout << "\t\t最小值：" << (numeric_limits<unsigned long long>::min)() << endl;
    cout << "double: \t\t" << "字节数：" << sizeof(double) <<endl;
    cout << "最大值：" << (numeric_limits<double>::max)();
    cout << "\t最小值：" << (numeric_limits<double>::min)() << endl;
    cout << "long double: \t\t" << "字节数：" << sizeof(long double) <<endl;
    cout << "最大值：" << (numeric_limits<long double>::max)();
    cout << "\t最小值：" << (numeric_limits<long double>::min)() << endl;
    cout << "float: \t\t\t" << "字节数：" << sizeof(float) <<endl;
    cout << "最大值：" << (numeric_limits<float>::max)();
    cout << "\t最小值：" << (numeric_limits<float>::min)() << endl;
    return 0;
}