C syntax

#include <stdio.h>

if printf scanf is used

#include <math.h>

if sin cos sqrt is used

#include <string.h>

if strlen strcpy strcmp strcat is used

for loop

while loop

do while loop

printf

printf("My age is %d and Pi is %.2f\n", age, pi);

Output: My age is 30 and Pi is 3.14

scanf

scanf("%d", &number);

if else statements

must declare and assign variables

#include <stdlib.h>

library to use system

#include <stdbool.h>

used if bool expressions

void main()

means the program does not send data back to the system

x==y

compare if they are equal

>= <=

greater than or equal
less than or equal

pre increment vs post increment

ternary operator

Y=(4 < 5) ? (42) : (9) Y=42

Y=(2==3) ? (a) : (b) Y=b

if statement

if (x <= 10)

y = x * x + 5;

switch

switch (variable) {

case 1: // Code runs if variable == 1

break;

case 2: // Code runs if variable == 2

break;

default:

// Code runs if nothing matches }

#define MAX 100

The compiler never sees "MAX"; it only sees the number 100.

const int max = 100;

creates a variable named max, assigns it the value 100, and flags it as "read-only."

array

int scores[] = {85, 90, 78, 92};

2d array

int Factorial (int n);

type of return value name of function type of argument

strcpy(string1,string2);

string 2 is copied onto string 1

int *p;

printf("%p\n", &myvar);