<< 0 and 1 directly define the C language macro definition 1 What is the difference

[Example 1] Program

The sample code:

#include <stdio.h>

#define TEST1 1 << 0
#define TEST2 (1 << 0)
#define TEST3 1

int main()
{
   printf("%#x \n", TEST1 + 4);
   printf("%#x \n", TEST2 + 4);
   printf("%#x \n", TEST3 + 4);
   return 0;
}

/*
0x10 
0x5
0x5
*/

Above.

[2] summary

Operator (<< and +) of different priorities, the results may lead to differences.

Seek truth from facts, according to local conditions, specific conditions.

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Select the cycle order summary