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closed as a duplicate of: Undefined Behaviour in C
Consider a part of program:

int i=4,t;
  t=i++ + i++ + i++;
 printf("%d",t);

Why the value of t comes out to be 15(in codeblocks)?
Since we have post increment so first value of i must be used
Therefore ans must be 12.

Secondly,
int i=4,t;
    t=++i + i++ + i++;
    printf("%d",t);
Its output must be 5+5+5=15 but it comes out to be 17 Why?
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