Parul takes as input two numbers: a and b. a and b can take integer values
between 0 and 255. She stores a, b and c as 1-byte data type. She writes the
following code statement to process a and b and put the result in c.
c = a + 2*b
To her surprise her program gives the right output with some input values of a and b,
while gives an erroneous answer for others. For which of the following inputs will it
give a wrong answer?

• a+2b=255
  Or
  a=255-2b
  
  Max value possible of b to give positive value of a is b=127
  So if b=127, a=1
  b=126, a=3
  ....
  b=1, a=253
  
  So all value of a from 1 to 253 and b's from 127 to 1 respectively will give right answer.. else these.. answer may get erroneous.
• 4 years agoHelpfull: Yes(4) No(0)
• Opyion a is right ans
• 4 years agoHelpfull: Yes(0) No(7)