//验证输入
#include<stdio.h>
#include<stdbool.h>
//验证输入是一个整数
long get_long(void);
//验证范围上下限是否有效
bool bad_limits(long begin, long end,
long low, long high);
//计算a-b之间的整数平方和
double sum_squares(long a, long b);
int main(void)
{
const long MIN = -10000000L;
const long MAX = +10000000L;
long start;
long stop;
double answer;
printf("This program computes the sum of the squares of"
"integers in a range.\nThe lower bound should not"
"be less than -1000000 and\nthe upper bound"
"should not be more than +10000000.\nEnter the"
"limits (enter 0 for both limits to quit):\n"
"lower limit:");
start = get_long();
printf("upper limit:");
stop = get_long();
while (start != 0 || stop != 0)
{
if (bad_limits(start, stop, MIN, MAX))
printf("Plase try again.\n");
else
{
answer = sum_squares(start, stop);
printf("The sum of the squares of the integers ");
printf("form %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);
printf(" is not an integer.\nPlease enter an ");
printf("integer value, such as 25, -178, or 3:");
}
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 bad_limits(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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