How to use the C Programming Cheat Sheet
- 1. Search or browseType a word like the function or task you need, or pick a section.
- 2. CopyEach snippet has its own Copy button, so you can paste it straight into your editor.
- 3. DownloadSave the whole C Programming cheat sheet as plain text or Markdown for offline revision.
What's in it
The sheet follows standard C (C11) as taught in B.Tech, BCA and diploma courses. The 36 snippets are organised into 11 sections: Basics, Operators, Control flow, Arrays, Strings, Pointers, Memory, Structs, Files, Functions, Tools.
Example
Search "pointer" to see int *p = &x; *p = 10;, which changes x through p, and p + 1, which moves by sizeof(*p) bytes rather than one byte. The Memory section shows the full pattern: allocate with malloc, check for NULL, and after free set the pointer to NULL so it can't be used by mistake.
Tips for using it
- Compile your lab programs with -Wall -Wextra; the warnings catch many beginner bugs.
- Trace pointer snippets in the C pointer visualizer to see the memory change.
A quick look, one snippet per section
- Basics:
#include <stdio.h>(smallest C program) - Operators:
7 / 2 → 3, 7 % 2 → 1, 7.0 / 2 → 3.5(integer vs real division) - Control flow:
do { ... } while (cond);(runs at least once) - Arrays:
int a[5] = {1, 2, 3};(remaining elements become 0) - Strings:
char s[] = "hi";(3 bytes including '\0') - Pointers:
int *p = &x; *p = 10;(pointer to x; change x through p) - Memory:
int *a = malloc(n * sizeof *a);(allocate and check) - Structs:
struct Student { char name[30]; int marks; };(define a struct) - Files:
FILE *f = fopen("data.txt", "r");(open a file and check)
Search the box above for the rest of the C Programming snippets, or download the full sheet.
Frequently asked questions
Which compiler?
Any standard C compiler: gcc, clang or MinGW. Turbo C differs in places.
Is C++ included?
No. See the C++ STL cheat sheet.
Is the C Programming cheat sheet free?
Yes. You can search, read and copy every snippet in the C Programming cheat sheet without signing up. The first time you download it, we ask once for your name and WhatsApp number; after that downloads and every other Uncodemy tool open straight away.