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 statements:

 int a=2, b=3, c=4;
 a=(b++) +c;
 b=a+(++c);

2) 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);
     }

3) Consider the following code fragment:

  int a,c; c=2;
 a=(c+ =5)*2

4) The precedence of arithmetic operators is (from highest to lowest)

5) Consider the following program fragment:

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