Why does the expression a = a + b - ( b = a ) give a sequence point warning in c++?

Question

Following is the test code:

int main()
{
    int a = 3;
    int b = 4;
    a = a + b - (b = a); 

    cout << \"a :\" << a << \" \" <<         


        

Answer 1

To solve it separate them in two different statements.

PS: Don't forget that humans may make mistakes performing arithmetic operations. Therefore is better to make the operations clearer by separating them in different statements. I hope I helped.

int main() 
{
   int a = 3;
   int b = 4;

   /* Two different Statements*/
   b = a;

   /* or a = a + b - a */
   a = a + b - b; 

   cout<<"a :"<