The big and small end problem caused by union union

Here is a multiple choice question to find the output value:

#include #include union Test{int i;char c[3];};int main(){Test t;t.i = 20;t.c[0] = 0;t.c[1] = 0;t.c[2] = 10;printf("%d\n", t.i);system("pause");}

A.20

B.655360

C.2580

D.Not sure

What should I choose?

==================================Separation Line===============================

General computers are in little endian mode. Assuming that in little endian mode, the following conditions are met:

Low address is low, high address is high

t.i = 20; //The memory layout after execution is as follows:

The memory layout after executing the following code is as follows:

t.c[0] = 0;
t.c[1] = 0;
t.c[2] = 10;

At this time, the value represented by the int type is: 0x000A0000 corresponds to the decimal system, which is 655360

Assuming big endian mode, then the following conditions are met:

High address is low, low address is high

t.i = 20; //The memory layout after execution is as follows:

The memory layout after executing the following code is as follows:

t.c[0] = 0;
t.c[1] = 0;
t.c[2] = 10;

At this time, the value represented by the int type is: 0x00000A14 corresponds to 2,580 in decimal.

To sum up, be more rigorous, you should choose D