Write a function to determine the return value of different mode processors

There are two types of processors:

Patterns of Big_endian and Little_endian

The Big_endian mode stores the operands from high to low bytes. The high byte holds the low of the number, and the lower byte holds the high of the data.

The Little_endian mode stores the operands from low to high bytes. Low bytes hold the low of the number and high bytes hold the data high.

such as: 0x1234

Memory Address: 0x4000 0x4001

Little_endian:0x4000:0x34 0x4001:0x12

big_endian:0x4000:0x12 0x4001:0x34

The Union union is stored in the order that all members are stored from the low address. The data members of a consortium (a common body) are stored from the low address.
Use Union to view the mode of the CPU. Returns 0 if the processor is Big_endian, 1 if Little_endian

The code is as follows:

#include <iostream>
using namespace std;
int Checkcpu ()
{
	Union w
	{
		int a;//4 bytes
		char b;//1 bytes
	}c;
	c.a=1;
	return (c.b==1);
}
int main (int argc, char* argv[])
{
	int i;
	I=checkcpu ();
	if (i==1)
	{
		cout<< "Little_endian" <<endl;
	}
	else
	{
		cout<< "Big_endian" <<endl;
	}
	return 0;
}

If the big-endian mode, from low address to high address c.a stored as 0x00 0x00 0x00 0x01,c.b is assigned to 0x00

If the small-end mode, from low address to high address c.a stored as 0x01 0x00 0x00 0x00,c.b is assigned to 0x01

Here's an example:

#include <iostream>
using namespace std;
void Checkcpu ()
{
	Union w
	{
		char b[4];//1 bytes
		int a;//4 bytes short
		int d;//2 bytes
	}c;< c9/>c.b[0]=2;
	C.b[1]=1;
	c.b[2]=3;
	c.b[3]=0;
	cout<< "C.a=" <<c.a<<endl;
	cout<< "c.d=" <<c.d<<endl;
}
int main (int argc, char* argv[])
{
	checkcpu ();
	return 0;
}

Output:

c.a=196866
c.d=258

The data in B is: 0x02 0x01 0x03 0x00

A:4 a byte, so,

Big_endian: In-memory data stored as: 0x02 0x01 0x03 0x00

Little_endian: In-memory data stored as: 0x00 0x03 0x01 0x02 c.a=0x00 0x03 0x01 0x02 =196866

D:2 a byte, so,

Big_endian: In-memory data stored as: 0x02 0x01 0x03 0x00

Little_endian: In-memory data stored as: 0x01 0x02 0x00 0x03 c.d=0x01 0x02=258