720 连续整数相加
include[HTML_REMOVED]
int main()
{
int A = 0, N = 0, sum = 0;
scanf(“%d%d”, &A, &N);
if(N<1)
while (N < 1)
{
scanf(“%d”, &N);
}
while (N > 0)
{
sum = sum + A;
A++;
N–;
}
printf(“%d”, sum);
return 0;
}