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

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

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1) Consider the following program fragment:

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

2) If the following variables are set to the values as shown below, then what will be the value of the following expression?

 answer=2;
 marks=10;
 !((answer<5)&&(marks>2))

3) Consider the following statements:

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

4) Which of the following data type will throw an error on modulus operation(%)?

5) 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;
     }