n++,n-- 后綴,先賦值后運算。
++n,--n 前綴,先運算后賦值。
int m = 7;
int n = 7;
int a = 2 * ++m; //a = 16,m = 8
int b = 2 * n++; //b = 14,n = 8
n++,n-- 后綴,先賦值后運算。
++n,--n 前綴,先運算后賦值。
int m = 7;
int n = 7;
int a = 2 * ++m; //a = 16,m = 8
int b = 2 * n++; //b = 14,n = 8