Can anyone tell me what the difference is between recursion and iteration?

To put it simply, recursion means calling yourself, such as:

int abc(...)

{

if( ...) //Recursion termination condition

{ return abc(...); }

return 0;

}

Recursion is to repeat a set of instructions and continuously derive new values ??based on the old values ??of variables, such as:

for(; ; ;) //Iteration termination condition

{

p>

a = b c;

b = a;

c = a;

}