What is the order of evaluation of function arguments in C?

We pass different parameters to some functions. Now we may have a question that what is the order of evaluation of function parameters. Is it from left to right or right to left?

To check the order of evaluation, we will use a simple program. Some parameters are passed here. From the output we can see how they are evaluated.

Sample code

#include<stdio.h>
void test_function(int x, int y, int z) {
   printf("The value of x: %d</p><p>", x);
   printf("The value of y: %d</p><p>", y);
   printf("The value of z: %d</p><p>", 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

From this output we can easily understand the evaluation sequence. First take z so it's 10, then take y so it's 11 and finally take x. So the value is 12.

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