Which of the structures is incorrect?
1:
struct s1{
int x;
long int li;
};
2:
struct s2{
float f;
struct s2 *s;
};
3:
struct s3{
float f;
struct s3 s;
};

What happens when you attempt to compile and run the following code?
#include <iostream>
#include <string>
using namespace std;
class B;
class A {
int age;
public:
A () { age=5; };
friend class B;
};
class B {
string name;
public:
B () { name="Bob"; };
void Print(A ob) {
cout << name << ob.age;
}
};
int main () {
A a;
B b;
b.Print(a);
return 0;
}

Which of the following structures are correct?
1:
struct s1{
int x;
char c;
};
2:
struct s2{
float f;
struct s2 *s;
};
3:
struct s3{
float f;
in i;
}

What happens when you attempt to compile and run the following code?
#include <iostream>
using namespace std;
void set(struct person*);
struct person
{
char name[25];
int age;
};
int main()
{
struct person e = {"Steve", 30};
set(&e);
cout<< e.name << " " << e.age;
return 0;
}
void set(struct person *p)
{
p?>age = p?>age + 1;
}

A condition expression used by if(), while(), and do-while() must evaluate to and only to: