Notes on the C programming language.

C is a widely used programming language, developed by Brian Kernighan and Dennis Ritchie during the 1970s. It is closely tied to the development of the Unix operating system.

A program written in C needs to be compiled - I use the Ubuntu pre-installed gcc. C programs can be debugged using gdb.


type *ptr A pointer of type named ptr
*prt The value of whatever prt is pointed at
*(ptr + i) The value of (whatever prt is pointed at plus i)
&thing The address of thing
type *ptr = &thing A pointer of type named ptr set to the address of thing

Converting strings to integers

ASCII Decimal
0 48
1 49
2 50
3 51
4 52
5 53
6 54
7 55
8 56
9 57


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