1. #include <iostream.h> void sumup (float&, float = 1.0, int = 1); void main () ... 2. #include <iostream.h> int manip (int, int); float manip (float, float); void main () { int x = 3; int y = 7; int z; float a = 6.8; float b = 13.6; int c; z = manip (x,y); c = manip (a,b); cout << z << c << endl; } int manip (int num1, int num2) { return (num1 * num2); } float manip (float num1, float num2) { return (num1 / num2); } 3. (b) 4. (d) 5. (b) 6. (b)