C / C ++ remove the end of the line spaces

for(int i = 0;i < n;i++){
    if(i == 0){
        cout << a[i];
    } else{
        cout << " " << a[i];
    }
}
或
for(int i = 0;i < n;i++){
    if(i == 0){
        printf("%d",a[i]);
    } else{
        printf(" %d",a[i]);
    }
}