Programming_Tips/c.md

C/C++

Block keyboard interruptions (CTRL+C):

Include the signal header :

#include signal.h

At the beginning of the main, insert

signal(SIGINT, fction)

with

• fction the function to be started on detection.
• SIGINT the interrupt to be detected.

##Some simple basics that helped :

About variables :

• age -> value
• &age -> pointer

About pointers :

• ptr -> ptr value(which is an address)
• *ptr -> variable value placed in the address.

If age is a variable :

• age is its value
• &age is its pointer

If ptr is a pointer :

• ptr is the pointer value (which is an address)
• *ptr is the value of the variable contained in at the address.

Pointers creation:

int *ptr = NULL; //Is just a creation, the * does not stand for anything else than declaring the pointer.

int age = 10;

*ptr=&age; //ptr is already created, the * now means that whe want to assign its value

• Those two are equivalent (used for structures):

a->b
*(a.b)