C++ if-else - Learn With AVRK

If-else in C++ Language

In C++ programming language, if statement is used to test the condition. There are various types of if statements in C++.

• if statement
• if-else statement
• nested if statement
• if-else-if ladder

C++ IF Statement

The C++ if statement tests the condition. If condition is true then program is executed.

if(condition)   
{
/*code if condition is true */   
} 
else
{
/*code if condition is false */
}   

C++ If Example -

#include <iostream>  
using namespace std;
int main ()
{
 int num = 10;   
 if (num % 2 == 0)
 {
  cout<<"It is even number"; 
 }
 return 0;
} 

Output -

C++ IF-else Statement

The C++ if-else statement also tests the condition. If block executes when condition is true otherwise else block is executed.

if(condition)   
{
/* code to be executed */ 
} 

C++ If-else Example -

#include <iostream>  
using namespace std;
int main ()
{
 int num = 11;
 if (num % 2 == 0)    
 {
  cout<<"It is even number"; 
 }
else 
{
cout<<"It is odd number"; 
}
 return 0;
} 

Output -

C++ If-else Example: with input from user -

#include<iostream>  
using namespace std;
int main ()
{
 int num;
 cout<<"Enter a Number: "; 
 cin>>num;
 if (num % 2 == 0)    
 {
  cout<<"It is even number"<<endl; 
 }
else 
{
cout<<"It is odd number"<<endl; 
}
 return 0;
} 

Output -

Output -

C++ If-else-if ladder Statement

The C++ if-else-if ladder statement executes one condition from multiple block of statements.

if(condition1)   
{
/*code to be executed if condition1 is true  */   
} 
else if(condition2)
{
/*code to be executed if condition2 is true */
else if(condition3)
{
/*code to be executed if condition3 is true */
}
... 
else
{
/*code to be executed if all the conditions are false */
}
}   

C++ If-else-if Example -

#include <iostream>  
using namespace std;  
int main () {  
       int num;  
       cout<<"Enter a number to check grade:";  
       cin>>num; 
            if (num <0 || num >100)   
            {    
                cout<<"wrong number";  
            }    
            else if(num >= 0 && num < 50){ 
                cout<<"Fail";    
            }    
            else if (num >= 50 && num < 60)   
            { 
                cout<<"D Grade";  
            }   
            else if (num >= 60 && num < 70)  
            {    
                cout<<"C Grade"; 
            }  
            else if (num >= 70 && num < 80)  
            {   
                cout<<"B Grade";  
            } 
            else if (num >= 80 && num < 90)    
            { 
                cout<<"A Grade";  
            }    
            else if (num >= 90 && num <= 100)  
            {   
                cout<<"A+ Grade";  
            }    
    }    

Output -

Output -

Also check out this : C++ Expression - Learn With AVRK