If -Else statements in C program

Topic:

  If-Else Statement 

                                                                                          

Content:

Expressions Condational Statements

What is Expressions & Statements ?

👉An expression is the combination of functions, operators, commas, variables, identifiers etc.

An expression, which

returns only two value either TRUE or FALSE is known as Boolean expression & Its becomes a statement.

CONDITIONAL STATEMENTS

👉Conditional statement is a feature of programming language which allows it to perform actions depending upon some conditions provided by the programmer. 

ØIf the given condition is true then the set of statements are executed otherwise body is skipped.  

ØTwo types of Conditional Statements in C are: 

         — if … else statement

         — switch case statemens

 The if Statement

Output Of The Program

Example Code:

#include <stdio.h>

 int main()

{

          int password=1234;

          printf("Enter The password:");

          scanf("%d", &password);

if ( password == 1234)

      {

           printf("Welcome To My World.");

      }

else

     {

          printf("Go To Hell");

     }

 return 0;

}

Nested If – else : 

What is If – else nesting?

👉Writing an entire if -else construct within either the body of the if statement or the body of an else statement is called “Nesting of if – else”..

Why is it needed ?

👉The if...else statement executes codes depending upon the condition is true or false. Sometimes, a choice has to be made from more than 2 possibilities. So the it allows to execute codes for more than two conditions.

Syntax of if-else :

if(condition 1 is true)

{

     if(condition 2 is true)

{

           statement 1;

  }

     else

  }

          statement 2;

   }

else

{

     statement 3;

}

👉Example:

Program to find the oldest among three:

#include <stdio.h>

int main ()

{

    int a,b,c;

    printf("Enter the ages for Imran, Mushfik, Riduan :");

    scanf("%d%d%%d", &a,&b,&c);

    if(a>b)

    {

        if (a>c)

        printf("%d = Imran is the oldest",a);

        else

            printf("%d = Riduan is the oldest",c);

    }

       else

        {

            if (b>c)

            printf("%d = Mushfik is oldest ",b);

         else

            printf("%d = Riduan is the oldest ",c);

        }

    return 0;

}

This Content is Created By:

Md.Imran Hossain , Md.Riduyanur Rahman , Md.Musfiqur Rahman

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