How to combine two if statements into one - c++

Question

Hi I have these two separate if statements, when put like so ;
if (powerlevel <= 0) // <--- ends up having no effect
if (src.health <= 0)
the_thing_to_do();
How do I combine these two if statements into one? is it possible? If so how?

Answer 1

If you want both statements to be true use logical AND
if(powerlevel <= 0 && src.health <= 0)
If you want either of the statements to be true use logical OR
if(powerlevel <= 0 || src.health <= 0)
Both of the above operators are logical operators

Answer 2

Use operator&& if you want both of them to be met (logical AND)
if(powerlevel <= 0 && src.health <= 0) { .. }
or operator|| if you want just one to be met (logical OR)
if(powerlevel <= 0 || src.health <= 0) { .. }

Answer 3

It depends if you want both to evaluate to true...
if ((powerlevel <= 0) && (src.health <= 0)) {
// do stuff
}
... or at least one ...
if ((powerlevel <= 0) || (src.health <= 0)) {
// do stuff
}
The difference being logical AND (&&) or logical OR (||)

Answer 4

Just an aternative if it is meaningful(sometimes).
Both true:
if (!(src.health > 0 || powerlevel > 0)) {}
at least one is true:
if (!(src.health > 0 && powerlevel > 0)) {}

Answer 5

Or if you don't want to use && you can use a Ternary Operator
#include <iostream>
int main (int argc, char* argv[])
{
struct
{
int health;
} src;
int powerlevel = 1;
src.health = 1;
bool result((powerlevel <= 0) ? ((src.health <=0) ? true : false) : false);
std::cout << "Result: " << result << std::endl;
}