1. Description : codes to infer the difference betwwen operator ‘&’ and operator ‘&&’ in C
2. solutions :
#include<stdio.h>
int main(){
int a = 6;
int b = 3;
printf("a & b = %d\n", a & b);
printf("a && b =%d\n", a && b);
return 0;
}
results:
a & b = 2
a && b =1
3. Interpretation:
&&operator is logical and
&operator is bitwise and
The expression x&&ywill return 1if both xand yis non-zero,and 0otherwise. For example,(-1 && 8)returns 1,(1 && 8)returns1,(0,8)returns 0.
The expression x&ywill perform a bitwise operation on each individual bit in xandy.For example,(3,8)will return 0. Integer3is 0011in binary, integer 8is 1000,then (3 & 8 )will return 0. The return value should not be inerpreted as a boolean value.
&has lower precedence than &&
The return value from x & yshould not be treated as a Boolean value at all. However, it can(depending on how the code is written) be treated as a Boolean array. If you have two integers, flag1andflag2then the result of flag1 & flag2will denote which flags that are toggled in both flag1and flag2.
参考资料：
https://stackoverflow.com/questions/49617159/difference-between-and-in-c
