programming for while 반복문

//(초기값;조건식;증감식)
for(int i=0; i<10; i++){
Console.WriteLine(i);
}

int i=0;
if(i<10){

}
i++;
// i += 1;
// i = i + 1;

int i = 0;
while(i<10){
    Console.WriteLine(i);
    i++;
}

int[] scores = {90,80,50,30,40,20};
for(int i=0; i<6; i++){
    Console.WriteLine(scores[i]);
}