Lesson 3-Conditional statements..if statement, If else statement, nested if statement, nested if-else statement -Coding overdose

1.If Statement

it is a conditional statement.. The if statement is used to execute the code, only when a condition is true.

if (condition) 

{ 

statements

}



Example 1. checking if a number is greater than 100


#include <iostream>
using namespace std;
int main ()

{
 int a;

   cout << "enter the number \n" ;
        cin >> a;


    if (a>100)
    {
        cout<<"yes the number is greater than 100" ;
    }


    return 0;


}

similarly you can use

>=       greater than or equal to 
<=       less than or equal to
equal to==
!=        not equal to




Example 2. checking the greater number out of two

#include <iostream>
using namespace std;
int main ()

{
    int a;
    int b;

    cout<< "enter a number a\n" ;
    cin>> a;

    cout << "enter another number b\n" ;
    cin>> b;

    if (a>b)
    {
        cout<< "a is greater than b";
    }


    if (b>a)
    {
        cout<< "b is greater than a" ;
    }


    if (b==a)
    {
        cout<< "both are equal" ;
    }

    return 0;

}

2.If-Else Statement

if (condition)

{ statements}
else
{statements}



Example 1. fail/pass in an exam

#include <iostream>
using namespace std;
int main ()

{

    int marks;


    cout << "enter your marks\n" ;
    cin>> marks;


    if (marks<33)

    {
        cout<< "failed";
    }

    else
    {
        cout<<"passed\n" << "congratulations";


    }

    return 0;
}

3.Nested If Statements


#include <iostream>
using namespace std;
int main ()


{
    int age;

    cout <<"enter ur age" ;
    cin>> age;

    if( age>14)

        {

                if (age>=18)
                 {
                cout<< "adult" ;
                  }


                else
                    {
                    cout <<"teenager";
                    }


          }

return0;

}

the above program wont give any output for age less than 14...
for that, you will need another else statement.


4.Nested If-Else Statements

#include <iostream>
using namespace std;
int main ()

{
    int age;
    cout <<"enter ur age \n" ;
    cin>> age;

    if( age>=13)

        {
                    if (age>=18)
                     {
                    cout<< "adult" ;
                      }

                         else
                        {
                         cout <<"teenager";
                         }
          }


          else { cout<<"you are a kid";}

return 0;

}

In the next blog,you will get to learn about loops.