Which bitwise operator is suitable for turning on a particular bit in a number?

Which bitwise operator is suitable for turning on a particular bit in a number?

2) Operator precedence determines which operator:

3) Consider the following program segment:

 main()
 {
   int a,b,c;
   b=3;
   a=2;
   a=2*(b++);
   c=2*(++b);
 }

4) What is the output of this C code?

#include <stdio.h>
     void main()
     {
         int x = 0;
         if (x = 0)
             printf("Its zero\n");
         else
             printf("Its not zero\n");
     }

5) What is the value of x in this C code?

#include <stdio.h>
     void main()
     {
         int x = 5 * 9 / 3 + 9;
     }