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?

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1) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         int x = 2, y = 1;
         x *= x + y;
         printf("%d\n", x);
         return 0;
     }

2) What should be the value of i and k at the end of the following program segments?

 int i,j,k;
 {
  j=5;
  i=2*j/2;
  k=2*(j/2);
 }

3) What is the output of this C code?

 #include <stdio.h>
     int main()
     {
         int a = 10, b = 5, c = 5;
         int d;
         d = a == (b + c);
         printf("%d", d);
     }

4) Operator precedence determines which operator:

5) Consider the following program fragment:

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