// for循环实现
int tnt;
int i;

tnt = 0;
for (i = 1; i < 10 + 1; i++)
    tnt += i;
cout << tnt << endl;

// while循环实现
int tnt;
int i;

tnt = 0;
i = 1;
while (i <= 10){
    tnt += i;
    i += 1;
}
cout << tnt << endl;