void main()
{
int a=1;
printf("%d %d %d",a,++a,a++);
}
the output is supposed to be 1 2 2....but it is 3 3 1
this is due to calling conventions of C. if anyone can
explain me how it happens?

Answers were Sorted based on User's Feedback



void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / sumant

In C the parameters are pushed on the stack from right to
left. So
1> it will push a=1 on the stack and do a++ making a=2
2> it will porform ++a making a = 3 and push value 3
3> it will push a on the stack which is 3

so the stack will have values 1 3 3 and it will POP in
the reverse order and thus printf will display 3 3 1

Is This Answer Correct ?    52 Yes 11 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / vishnu

first calculations will be done from right to left and then
prints accroding to the parameters passed.

Is This Answer Correct ?    29 Yes 8 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / sathish

execution does from right to left and while printing it goes from left to right.

Is This Answer Correct ?    18 Yes 3 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / pranjal kumbang

Output:3 3 1 This
is because,C's calling convention is from right to left.That
is ,firstly 1 is passed through the expression a++ and then
a is incremented to 2.Then result of ++a is passed.That is,a
is incremented to 3 and then passed.Finally,latest value of
a,i.e. 3,is passed.Thus in right to left order,1 ,3, 3 get
passed.Once printf() collects them,it prints them in the
order in which we have asked it to get them printed(and not
the order in which they were passes).thus 3 3 1 gets
printed.

Is This Answer Correct ?    8 Yes 2 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / hemanth

All,

output of above code is compiler depended i.e the order of
evalulation.

Is This Answer Correct ?    8 Yes 5 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / keerthi

while printing the output it starts from right hand
side ..so first 'a++' value is printed then '++a' value and
last it prints 'a' value

Is This Answer Correct ?    12 Yes 16 No

void main() { int a=1; printf("%d %d %d",a,++a,a++); } the output is supposed to be 1..

Answer / minchoo

answer is 2 2 1 and not 3 3 1

Is This Answer Correct ?    4 Yes 43 No

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