The left shift operator moves the bit pattern of its left operand to the
left by the number of bits specified by its right operand. The bits vacated
by the left shift are filled with zeros. The right shift operator moves 
the bit pattern of its right operand to the right by the number of bits 
specified by its right operand. If the variable is an unsigned data type,
the vacated bits will be filled with zeros; if the variable is signed, the
vacated bits will be filled with the sign bit.

int a;
a = 5;
a = a << 2;   // The bits of a will be shifted two bits to the left  
              // and the value of 20 assigned to a
a = 5;
a = a >> 2;   // The bits of a will be shifted two bits to the 
              // right and the value of 1 assigned to a