question 4 and 5 please

Given the Ct++program below, what is ultimately displayed on the screen? void foo(int \&x) \{ x+=1;} int mainc) int a=5 foo (a); cout a; 4 5 6 7 Question 5 Given the C++ program below, what is ultimately displayed on the screen? void foo(int x){ x+=1;} int mainc) int a=5; foo (a); cout a