Programming in C - I/O Operations

2. If y is of integer type then the expression
3 * ( y - 8 ) / 9 and ( y - 8 )/ 9 * 3

  • Option : C
  • Explanation :
    If y = 11, the expression 3 * (y - 8) / 9 becomes 3 * 3 / 9. Which evaluates to 1.
    But the expression ( y - 8 )/ 9 * 3 becomes 3 / 9 * 3. Which evaluates to 0 (since 3 / 9 is 0)
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3. The following code fragment
int x, y =2, z, a;
x = ( y* = 2 ) + ( z = a = y )
printf ( "%d" , x );

  • Option : C
  • Explanation :
    y * = 2 means y = y * 2 i.e. y = 4, in this problem.
    So, the expression is equivalent to x = 4 + 4, which is 8.
    So, 8 will be printed.
    However, the order in which the operands are evaluated is implementation-dependent.
    If the right operand is evaluated first, the result will be 6.
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5. x - = y + 1; means

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