Using Pointers in a function
I am learning C, and am am trying to create my own "swap" function for practice that takes in two numbers and puts them in two different variables. I then set one pointer to each. This is where I get stuck.
What should I pass into the function parameters: by this I mean do I pass say, *num1, or the address it points to, num1. I am confused. Please provide code examples.
Thanks
Yes, the address.
Code:void swap( int* a, int* b ); int main( void ) { int i, j; swap( &i, &j ); int * p = &i, * q = &j; swap( p, q ); }
Code:#include <cmath> #include <complex> bool euler_flip(bool value) { return std::pow ( std::complex<float>(std::exp(1.0)), std::complex<float>(0, 1) * std::complex<float>(std::atan(1.0) *(1 << (value + 2))) ).real() < 0; }
It will probably be easier if you provide code examples. But I think Sebastiani might have nailed this one.Originally Posted by greeneyehawk
C programming resources:
GNU C Function and Macro Index -- glibc reference manual
The C Book -- nice online learner guide
Current ISO draft standard
CCAN -- new CPAN like open source library repository
3 (different) GNU debugger tutorials: #1 -- #2 -- #3
cpwiki -- our wiki on sourceforge
I'm assuming you know how memory addresses work. I'm also assuming other people will post code for you. This is just how I learned how pointer operators work.
* gets the value at an address
& gets the address of a value
That's it. They really aren't that complicated once you understand them
Thanks!
Thank you so much, I got it.
