if

if statement 

if statement is the most simple decision-making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e if a certain condition is true then a block of statement is executed otherwise not. 
Syntax: 

if(condition) 

{

   // Statements to execute if

   // condition is true

}

Here, the condition after evaluation will be either true or false. C if statement accepts boolean values – if the value is true then it will execute the block of statements below it otherwise not.

Flowchart 
 

1.Write a Program to check user input number is odd Or Even.

#include<stdio.h>

void main()

{

    int a;

    printf(" Enter the Number=");

    scanf("%d",&a);

    if ((a%2)==0)

    {

        printf(" Entered number is Even");

    }

    if ((a%2)!=0)

    {

        printf(" Enetred number is odd");

    }

}

Output: