Simple Math C++ questions/double checking

[DS9596]

Can someone check if I am doing these right please, thanks ?

int a=3, b=5, x;
x= a/b + b/a +a%b + b%a; cout << x;    //  x=0+1+0+1= 2
y=float(b/a)+ float(b)/a; cout << y;   //  y=1.6+1=2.6
z=a*b/2; cout << z;                    //  z= 4
w=pow(b, a)+sqrt(a+b);  cout << w;     //  w=125+2sqrt(2)



int a=4, b=7, x; 
a++; --b;
x=a+b; cout<<"x"<< x;        //x=11

a=4; b=8
x=a++*--b; cout<<"x="<< x;   //x=35

a=3; b=5;
a+=3+b; b*=2;
x=a+b; cout<< "x="<< x;      //x=13

[NathanOliver]

What happens if you run the code? I can tell you 5%3 is 2 not 1. % works as 5 - ((5/3) * 3) or a%b = a - ((a/b) * b). Line 4 should be 7 based on order of operations.

[tinstaafl]

If the comments you added are supposed to be the answers you want, then no they are not all right. Line 11 gives the right answer the rest give different answers

[YarMak]

Line 3, 4 and 5 needs declaration y, z and w. otherwise, with declaration, line 3 will give 1 since the operands are 'int'. line 4 will not give 4. it will give 6 or 7 depending on the precidence. line 5 will give 127 or 127.2828 depending on the declaration of w.
Line 18 has an out put of 28 becouse, a was increased after the operation while b is decreased before.
In line 18, the out come is 21 since a=a+3+b and b=b*2.