求50+51+52+53+......+100的值

#include"stdio.h"
void main()
{
int sum = 0,i = 50;
while(i<=100)
{sum = sum + i;
i++;
}
printf("%d",sum);
}
我写的，不是很好，见谅

int sum = 0;
for(int i = 50; i <= 100; i++){
sum = sum + i;
}
printf("%d",sum);

3825

(50+100)*51/2 =3825

(50+100)*51/2=3825

5050-24*50-25=5050-1225=3825