Increment Difference between C and Java

Both C and Java are high-level language.

Both language provides support for variable increment such as the statement: “c++”, “++c”.

However I have discovered some difference between them, where my knowledge is not able to define it currently.

Consider a piece of code in C:

#include <stdio.h>

int main(void) {
    int c = 1;
    c = c++ + ++c;
    printf("this c: %d", c);
    return 0;
}

The output will be c = 5;

#include <stdio.h>

int main(void) {
    int c = 1;
    c = c++ + c++;
    printf("this c: %d", c);
    return 0;
}

The output will be c = 4;

However in Java,

        int c = 1;
        c = c++ + ++c;
        System.out.println(c);
        int d = 1;
        d = d++ + d++;
        System.out.println(d);

The output will be c = 4 and d = 3

Therefore, this is the difference between inner execution structure for both language and need to be researched in order to fill in the blank here.

To be continued…