deeksonparlma/C_Lang

Learn C-Lang

Author Dickson

Structure

preprocessor directives

#include<x.h>

• examples of preprocessor directives

<stdio.h> , <math.h> , <string.h>

int main()

This is an entry point to any C program

int main()
{
 //statements
}

Variables

Declaration

Datatype Name;

Initialization

Datatype Name = Value;

Constants

Declaration

local constants

const Datatype Name= Value;

Global constants

#define Name Value

• Global constants have no semi-colon at the end of the line

Arrays

Declaration

Datatype Name[size];

Initialization

Datatype Name[size] = {Value,value,Value};

Functions

Declaration

Datatype Name(arg1,arg2);

• usually done below preprocessor directives and before int main() Function

Initialization

Datatype Name(arg1,arg2){
  //statements
}

Output data

printf("");

Collect Data and assign a variable

scanf("%d",&variable);

Loops

while

while(condition)
{
//statements
  increment++;
}

Do...while

do
{
  //statements
}
while(condition)

executes the statements at least once before the condition is checked

For loop

for (i=0; i<ArraySize; i++)
{
 //statements
}

• Break - exits loop completely
• Continue - Skips statements for current iteration before proceeding to the next iteration