print the series 2-4+6-8+10.....n using java
int a=2,n=10; // n for number of terms
//a is the starting value
int sum=0;
for(int i=1;i<=n;i++)
{
if(i%2==0)
{
sum=sum-a;
}
else
{
sum=sum+a;
}
a=a+2;
}
System.out.println(sum);
How to print 9,99,8,89,7,79....
/ common way to write int a=9,n=10 ; // n value you can take anything for(int i=1;i<=n;i++) { if(i%2==1) { System.out.print(a); } else { System.out..print(a*10+9); a--; }}
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