Question

if x=8, find the value of y, if y=x-(- -x* x++)+ (++x)*3
use computer increment and decrement operator way
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Answer 1

Given:

• x=8

To solve:

• y=x-(- -x* x++)+ (++x)*3

Solution:-

$\sf \bold{y=x-(--x * x++) + (++x) *3 } \sf \\ \sf \: y = 8 - (7 *7) + (9)*3 \\ \sf \: y = 8 - 49 + 27 \\ \sf \: y = - 49 + 35 \\ \sf \green{\boxed{ \purple{ \bold{y = 14}}}}$

Always remember:-

• --x or ++x is called Prefix increment
• x++ or x-- is called Postfix increment
• Prefix increment first increase their values then moves forward.
• Postfix increment first move forward then the value gets increased.
• Here x is originally 8.
• --x * x++ So here the value of x first decreases due to --x which is multiplied with x++.
• x++ will have 7 but soon it reaches ++x(moves forward ) then it becomes 8
• ++x will first increase the value from 8 to 9 and then moves forward
• Calculating...
• you finally gets y=14