C++ if-else

by Online Tutorials Library July 14, 2022

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.

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:/p>

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  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

Output:

Enter a number:12 It is even number

C++ IF-else-if ladder Statement

The C++ if-else-if ladder statement executes one condition from multiple 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:

Enter a number to check grade:66 C Grade

Output:

Enter a number to check grade:-2 wrong number

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