Can anybody please explain this program?

Question

#include <stdio.h>
int main()
{
int a = 15, b;
b = (a++) + (a++);
a = (b++) + (b++);
printf("a=%d b=%d", a, b);
return 0;
}

Answer 1

Hope these will help..
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edit:
Lalitkumar Prajapat

int a=15;

b = a++ + a++ ; //15+16=31 , now a=17, first it's value uses in print and increments next.

a = (b++) + (b++) ; // 31 + 32 = 63

finally a= 63, b=33

but it may produce undefined behaviour also..
cannot predict outcome same on different compilers ( in c/c++) .

https://www.sololearn.com/Discuss/2038766/?ref=app

read these ones. hope you can clearly understand then....

Answer 2

in the first operation you can look like
b=last a + new a (15+16)=31
a=17
a=last b + new b(31+32)=63
b=33