#include <stdio.h>
int main()
{
unsigned char ch=0x5B;
int i;
printf("please inpute number:");
scanf("%d",&i);
ch|=(1<<(i-1));
printf("ch=%#x\n",ch);
return 0;
}
#include <stdio.h>
int main()
{
unsigned char ch=0x5B;
int i;
printf("please inpute number:");
scanf("%d",&i);
ch&=~(1<<(i-1));
printf("ch=%#x\n",ch);
return 0;
}