if-else.md

C++ if-else

In C++ programming, 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. It is executed if condition is true.

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

---

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

It is even number

---

C++ IF-else Statement

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

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

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

It is odd number

---

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

Enter a number:11
It is odd number

Enter a number:12
It is even number

---

C++ IF-else-if ladder Statement

Syntax

    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    
    } 

    #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

Enter a number to check grade:66
C Grade