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C++ - If Else

If Statement:

The If statement is used to execute a block of code when condition is true.

Syntax

if(condition){
  statements;
}

Flow Diagram:

#include <iostream>
using namespace std;
 
int main (){
    int i = 15;
    if ( i % 3 == 0){
        cout<<i<<" is divisible by 3.\n"; 
    }
    return 0;
}

Output

15 is divisible by 3.

If-else Statement:

The else statement is always used with If statement. It is used to execute block of codes whenever If condition gives false result.

Syntax

if(condition){
  statements;
}
else{
  statements;
}

Flow Diagram:

#include <iostream>
using namespace std;
 
int main (){
    int i = 16;
    if ( i % 3 == 0){
        cout<<i<<" is divisible by 3.\n"; 
    }
    else{
        cout<<i<<" is not divisible by 3.\n"; 
  }
    return 0;
}

Output

16 is not divisible by 3.

else if Statement:

else if statement is used to tackle multiple conditions at a time. For adding more conditions, else if statement in used. Please see the syntax.

Syntax

if(condition){
  statements;
}
else if(condition){
  statements;
}
...
...
...
else {
  statements;
}
}

Flow Diagram:

#include <iostream>
using namespace std;
 
int main (){
    int i = 16;
    if ( i > 25){
        cout<<i<<" is greater than 25.\n"; 
    }
    else if(i <=25 && i >=10){
        cout<<i<<" lies between 10 and 25.\n"; 
    }
    else{
        cout<<i<<" is less than 10.\n"; 
  }
    return 0;
}

Output

16 lies between 10 and 25.

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