[DUPLICATE] Please explain me how the following code works?

Question

int x=1,y=1,z=1,t=1;
int sum1=++x + x++; //sum1=5
int sum2=y++ + ++y; //sum2=4
int sum3=++z + ++z; //sum3=6
int sum4=t++ + t++; //sum4=3

Answer 1

When two or more increment or decrement are applied in C++...
it depends on compiler...
most of the time the value varies for such expression...
since there is no such standard developed to handle multiple increment/ decrement on the same line in C++...
https://www.sololearn.com/Discuss/205998/?ref=app