Numbers which are divisible by 2 are called even numbers (ending with 0 ,2,4,6,8 ), while numbers that are not divisible by 2 are called odd numbers (ending with 1, 3,5,7,9 )
Example : 9
Output :
Sum of First 9 Even Numbers = 2+4+6+8+10+12+14+16+18=90
Sum of First 9 Odd Numbers = 81
Approach : Iterative Method
class Sum{
public static void main(String args[] ) {
int n=9;
int evenSum=0,oddSum=0;
for(int i=1;i<=2*n;i++ ) {
if(i%2==0){
evenSum=evenSum+i;
}
else{
oddSum=oddSum+i;
}
}
System.out.println(“Sum of First “ +n +“Even Numbers=”+evenSum);
System.out.println(“Sum of First”+n+“Odd Numbers= “ +oddSum);
}
}