C PROGRAMMING FROM

PRESENTED BY SONAKSHI SARKAR

A program is set of instructions .

WHAT IS A PROGRAM ?

WHAT IS REQUIRED TO WRITE

A PROGRAM ?

Ans : Computer language (which is C in this case )

Alphabets Digits and Special symbols

Constants Variables and keywords

Instructions

Program

STEPS IN LEARNING C

C constants

Primary constants

Integer constants

Real constants

Character constants

Secondary constants

Array

CONSTANTS

VARIABLES

ENTITY THAT VARIES DURING PROGRAM EXECUTION

OPERATORS

program header comment

preprocessor directives (if any)

int main ( void ) { statement(s) return 0 ; }

Anatomy of a C Program

/* Filename: hello.c Author: BT 414 Date written: 17/10/2011 Description: This program prints the greeting

“Hello, World!” */

#include <stdio.h>

int main ( void ) { printf ( “Hello, World!\n” ) ; return 0 ; }

A Simple C Program

#include <stdio.h> int main(){ int num;

printf("Enter a number you want to check.\n”); scanf("%d",&num); if((num%2)==0) //checking whether remainder is 0 or not. printf("%d is even.",num); else printf("%d is odd.",num); return 0; }

Output 1Enter a number you want to check. 25 25 is odd.Output 2Enter a number you want to check. 2 2 is even.