C++ Data Types

What is the output of this C code?

void main() {

cout<<sizeof(float);

}

Comment on the output of this C code?

void main()
{
float f1 = 0.1;
if (f1 == 0.1)
cout<<"equal\n";
else
cout<<"not equal\n";
}

void main()
{
float f1 = 0.1;
if (f1 == 0.1f)

cout<<"equal\n";
else
cout<<"not equal\n";
}

What is output?

cout<<sizeof("1");

What is output?

cout<<sizeof(1);