Why and when evaluates from left to right

Question

#include<stdio.h>
void test_function(int x, int y, int z)
{  
 printf("The value of x: %d\n", x);  
 printf("The value of y: %d\n", y);  
 printf("The value of z: %d\n", z);
}
main()
{  
 int a = 10;    
test_function(a++, a++, a++);
}

Output

The value of x: 12
The value of y: 11
The value of z: 10

Answer 1

But in which cases our left to right evaluation occurs if the compiler of c has a ability to evaluate from left to right if need ?