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) Consider the following program segment:

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

2) Which among the following are the fundamental arithmetic operators, ie, performing the desired operation can be done using that operator only?

3) What is the output of this C code?

#include <stdio.h>
     int main()
     {
         int a = 10;
         double b = 5.6;
         int c;
         c = a + b;
         printf("%d", c);
     }

4) What is the output of this C code?

#include <stdio.h>
     void main()
     {
         unsigned int x = -5;
         printf("%d", x);
     }

5) The operator && in 'C' language is a (n):