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https://github.com/tomiis4/CLang
My CLang projects with cheatsheet
https://github.com/tomiis4/CLang
c c-cheatsheet cheatsheet
Last synced: 2 months ago
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My CLang projects with cheatsheet
- Host: GitHub
- URL: https://github.com/tomiis4/CLang
- Owner: tomiis4
- Created: 2022-10-15T15:48:53.000Z (almost 2 years ago)
- Default Branch: main
- Last Pushed: 2023-10-02T16:41:26.000Z (about 1 year ago)
- Last Synced: 2023-10-02T22:38:16.074Z (about 1 year ago)
- Topics: c, c-cheatsheet, cheatsheet
- Language: C
- Homepage:
- Size: 212 KB
- Stars: 0
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# C Cheatsheet 
* [File](#file)
* [Hello world](#hello-world)
* [Importing libraries](#importing-libraries)
* [Variables](#variables)
* [struct](#struct)
* [Functions](#functions)
* [Logic statements](#logic-statements)
* [if/else](#ifelse)
* [switch/case](#switchcase)
* [Loops](#loops)
* [for-i](#for-i)
* [while](#while)
* [Converting](#converting)
* [Build-in iunctions](#build-in-functions)
* [printf](#printf)
* [scanf](#scanf)
* [memory](#memory)
* [Pointers](#pointers)
* [Libraries](#libraries)
* [time.h](#time.h)
* [Projects](#projects)
## File
### Run file
```sh
gcc .c -o .exe
./.exe
```
## Hello world
```c
#include
int main() {
printf("Hello, world\n");
return 0;
}
```
## Importing libraries
```c
#include
```
## Variables
```c
// declare variable
= ;
// declare array
[] = {, };
// string
char [] = "";
char [] = "";
/*
Types:
unsigned int, short, long = %u = positive number
signed int, short, long = %d = negative numbers
bool = %d = true/false
char = %c = one character (in single quiote)
int = %d = numbers
short = %hd = numbers (-32_768 to 32_767)
long = %ld = numbers (-9223372036854775808 to 9223372036854775807)
float = %f = floating numbers (6 decimals)
double = %lf = floating numbers (15 decimals)
long double = %Lf = floating numbers (19 decimals)
void = N/A = only for function return as empty
*/
```
### structs
```c
// create struct
struct {
;
;
}
// initialize empty struct variable
struct ;
// initialize filled struct variable
struct = {, };
```
## Functions
```c
name() {
//...
}
// return
name() { return x }
// parameters
name( param1) { }
```
## Logic statements
### If/else
```c
if (condition) {
//...
} else if (condition2) {
//...
} else {
//...
}
```
### Switch/case
```c
switch (statement) {
case x:
//...
break;
case y:
//...
break;
default:
//...
}
```
## Loops
### For-I
```c
for (int i=0; i < 10; i++) {
//...
}
```
### While
```c
while (condition) {
//...
}
```
## Converting
```c
// str -> int
#include
int number = atoi();
// int -> str
#include
char str[20];
sprintf(str, "%d", );
// int -> float
float decimal = (float) ;
// float -> int
int number = (int) ;
```
## Build-In Functions
### printf
```c
// print formatted output
// without variable
printf("Hello, world");
// with variable
printf("Hello, ", );
```
### scanf
```c
// get user input
scanf(, );
```
### memory
```c
// todo
```
## Pointers
```c
// create new pointer variable with name pointer
*pointer;
// change pointer address
pointer =
;
// change data from address/pointer
*pointer =
// read data from address/pointer
*pointer
// get address from variable
&variable
```
## Libraries
### time.h
```c
// get start time
clock_t startTime = clock();
// create delay
void delay(int ms) {
clock_t startTime = clock();
while (clock() < startTime + msDelay);;
}
```
## Projects
- Calculator
- Sorting algorithm
- Snake