how to printf only number in odd index/array?

Question

example:
input
1 2 3 4 5 //a[0] a[1] a[2] a[3] a[4]

output
2 4 // because 2 is in index a[1] and 4 is in index a[3] which is odd number

Answer 1

for(i=1;i<arsize;i+=2)
cout<<ar[i];

OR

for(i=0;i<arsize;++i)
if(i%2)
cout<<ar[i];