What is output? a include <iostreom. h>
void sub (float & x)
{ x + =2;
cout <<" \nx="<<x;
}
اے
void main ()
{ clrser ()
float x = 5.8
cout<<" \nx="<<x'
sob (x);
Cout <<"\nx="<<x
getch ();
}​

x=5.8

x=7.8

x=7.8

Explanation:

I repaired the code somewhat (see below).

Since x is passed as a reference variable to the sub function, inside sub() the original variable is modified, so the changed value affects the variable declared in main().

If you would remove the & in sub, this wouldn't happen, and the variable in main would keep its value 5.8.