Shell & Script programming with Unix Increment and Precedence. a=-2; b=3; c=5 an

Question

Shell & Script programming with Unix

Increment and Precedence.

a=-2; b=3; c=5

ans = $((++a - b++ * ++c))

echo "ans1==$ans, a==$a, b==$b, c==$c;

Output 1 _______________________________________________

a=-2; b=3; c=5

(( ans2 = --a + ++b % c-- ))

echo "ans2==$ans2, a==$a, b==$b, c==$c"

Output 2 _______________________________________________

a=-2; b=3; c=5

ans3=$(( ++b / a-- * - ++c ))

echo "ans3==$ans3, a==$a, b==$b, c==$c"

Output 3 _______________________________________________

a=-1; b=0; c=2;

(( r4 = ++a && b-- || -c--))

echo "ans4== $r4, a== $a, b== $b, c== $c"

Output 4 _________________________________________

a=-1; b=0; c=2

(( r5 = -a-- && -++b || c--))

echo "ans5== $r5, a== $a, b== $b, c== $c"

Output 5 _________________________________________

Explanation / Answer

a=-2; b=3; c=5
ans=$((++a - b++ * ++c))
echo "ans1==$ans, a==$a, b==$b, c==$c";

#Output 1 __________ans1==-19, a==-1, b==4, c==6_____________________________________

a=-2; b=3; c=5
(( ans2 = --a + ++b % c-- ))
echo "ans2==$ans2, a==$a, b==$b, c==$c"

#Output 2 _____________ans2==1, a==-3, b==4, c==4__________________________________

a=-2; b=3; c=5
ans3=$(( ++b / a-- * - ++c ))
echo "ans3==$ans3, a==$a, b==$b, c==$c"

#Output 3 _____________ans3==12, a==-3, b==4, c==6__________________________________

a=-1; b=0; c=2;
(( r4 = ++a && b-- || -c--))
echo "ans4== $r4, a== $a, b== $b, c== $c"

#Output 4 _____________ans4== 1, a== 0, b== 0, c== 1____________________________

a=-1; b=0; c=2
(( r5 = -a-- && -++b || c--))
echo "ans5== $r5, a== $a, b== $b, c== $c"

#Output 5 _______________ans5== 1, a== -2, b== 1, c== 2__________________________

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