Master ()

{

int i，n；

int a = 0；

int s = 0；

Printf ("Please enter n:");

scanf("%d "，& ampn)；

for(I = 1； I<n+1; i++)

{

a = a * 10+I；

s = s+a；

}

Printf ("Result is %d \n", s);

}

There is a problem. When n is greater than 5, there is a problem with the display. Because it is difficult for C to define a larger number, it is considered to be represented by a string.