please explain

/* please explain why always get a different out put does print f evaluate from right to left even though there some difference . Is there a procedence for ++a and a++ */

Code:

#include <stdio.h>
 int main()
{

    int a = 10;
    a= 10;
    printf("a a++ a ++a a     %d %d %d %d %d\n" , a, a++, a, ++, a);

 a= 10;
    printf("a ++a a a++ a     %d %d %d %d %d\n" , a, ++a, a ,a++, a);

 a= 10;
    printf("a ++a a ++a a     %d %d %d %d %d\n" , a, ++a, a, ++a, a);

 a= 10;
    printf("a a++ a a++ a     %d %d %d %d %d\n" , a, a++ ,a ,a++ ,a);

 a= 10;
    printf("a  a++ a     %d %d  %d\n" , a, a++ a);

 a= 10;
    printf("a  ++a a     %d %d  %d\n" , a, ++a a);

 a= 10;
    printf("a a++ a a++ a a++ a ++a a   %d %d %d %d %d %d %d %d %d\n" \
, a, a++ ,a ,a++ ,a, a++ , a, ++a, a);

return 0;

}

 

All the compiler is required to do is update the operator at some point in execution; it may occur before the value is printed or after it's printed.

Here's a great explanation of how the compiler handles it.