#include <stdio.h>
#include <stdbool.h>
long get_long(void);
bool isWrongInput(long begin, long end,long low, long high);
double sum_squares(long a, long b);
int main(void)
{
const long MIN = -10000000L; // lower limit to range
const long MAX = +10000000L; // upper limit to range
long start; // start of range
long stop; // end of range
double answer;
//from w w w . j av a 2 s .c om
printf(Enter the limits (0 to quit)lower limit\n: );
start = get_long();
printf(upper limit: );
stop = get_long();
while (start !=0 || stop != 0)
{
if (isWrongInput(start, stop, MIN, MAX))
printf(Please try again.\n);
else
{
answer = sum_squares(start, stop);
printf(The sum of the squares of the integers );
printf(from %ld to %ld is %g\n, start, stop, answer);
}
printf(Enter the limits (enter 0 for both limits to quit):\n);
printf(lower limit: );
start = get_long();
printf(upper limit: );
stop = get_long();
}
printf(Done.\n);
return 0;
}
long get_long(void)
{
long input;
char ch;
while (scanf(%ld, &input) != 1)
{
while ((ch = getchar()) != '\n')
putchar(ch); // dispose of bad input
printf( is not an integer.\n);
}
return input;
}
double sum_squares(long a, long b)
{
double total = 0;
long i;
for (i = a; i <= b; i++)
total += (double)i * (double)i;
return total;
}
bool isWrongInput(long begin, long end,
long low, long high)
{
bool not_good = false;
if (begin > end)
{
printf(%ld isn't smaller than %ld.\n, begin, end);
not_good = true;
}
if (begin < low || end < low)
{
printf(Values must be %ld or greater.\n, low);
not_good = true;
}
if (begin > high || end > high)
{
printf(Values must be %ld or less.\n, high);
not_good = true;
}
return not_good;
}
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