C Reference Cheat Sheet (Page 6 of 13) in pdf

C Reference Cheat Sheet

Ashlyn Black

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Condit i onal (Branc h ing)

Iterative (Looping) (cont)

if, else if, else

Loop keyword.

Evaluates b if a is true.

Loop delimiters.

if(a) b;

{}

Evaluates b and c if a is true.

Loop contents.

if(a){ b; c; }

c++;

Evaluates b if a is true, c

Loop keyword and condition parenthesis. Note

if(a){ b; }else{ c; }

while();

semicolon.

otherwise.

Test condition.

Evaluates b if a is true,

c != 'Z'

if(a){ b; }else if(c){ d;

otherwise d if c is true,

}else{ e; }

for

otherwise e.

int i; for(i = 0; n[i] != '\0'; i++){} (C89)

switch, case, break

Evaluates c if a equals b.

switch(a){ case b: c; }

for(int i = 0; n[i] != '\0'; i++){} (C99+)

Evaluates b if a matches no

switch(a){ default: b; }

Compact increment/decrement based loop.

other case.

Declares integer i.

int i;

Evaluates d if a equals either b

switch(a){ case b: case c:

Loop keyword.

for()

or c.

d; }

Initialises integer i. Semicolon.

i = 0;

Evaluates c, e and f if a equals

switch(a){ case b: c; case

Test condition. Semicolon.

b, e and f if a equals d,

n[i] !=

d: e; default: f; }

otherwise f.

'\0';

Increments i. No semicolon.

Evaluates c if a equals b, e if a

i++

switch(a){ case b: c; break;

equals d and e otherwise.

case d: e; break; default: f;

Loop delimiters.

{}

}

continue

int i=0; while(i<10){ i++; continue; i--;}

Iterative (Looping)

Skips rest of loop contents and restarts at the beginning of the loop.

while

break

int x = 0; while(x < 10){ x += 2; }

int i=0; while(1){ if(x==10){break;} i++; }

Loop skipped if test condition initially false.

Skips rest of loop contents and exits loop.

Declare and initialise integer x.

int x = 0;

Loop keyword and condition parenthesis.

while()

Console Input/ O utput

Test condition.

x < 10

#include <stdio.h>

Loop delimiters.

{}

Characters

Loop contents.

x += 2;

Returns a single character's ANSI code from the input

getchar()

stream buffer as an integer. (safe)

do while

Prints a single character from an ANSI code integer to

putchar(int)

char c = 'A'; do { c++; } while(c != 'Z');

the output stream buffer.

Always runs through loop at least once.

Strings

Declare and initialise character c.

char c = 'A';

By Ashlyn Black

Published 28th January, 2015.

C Reference Cheat Sheet Page 6

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