求一个范围内的所有整数的平方和

#include <stdio.h>// validate that input is an integerint get_int(void);// validate that range limits are validbool bad_limits(int begin, int end, int low, int high);// calculate the sum of the squares of the integers// a through bdouble sum_squares(int a, int b);int main(void){    const int MIN = -1000;  // lower limit to range    const int MAX = +1000;  // upper limit to range    int start;              // start of range    int stop;               // end of range    double answer;       printf("This program computes the sum of the squares of "           "integers in a range.\nThe lower bound should not "           "be less than -1000 and\nthe upper bound should not "           "be more than +1000.\nEnter the limits (enter 0 for "           "both limits to quit):\nlower limit: ");    start = get_int();    printf("upper limit: ");    stop = get_int();    while (start !=0 || stop != 0)     {        if (bad_limits(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 %d to %d is %g\n", start, stop, answer);        }        printf("Enter the limits (enter 0 for both "               "limits to quit):\n");        printf("lower limit: ");        start = get_int();        printf("upper limit: ");        stop = get_int();    }    printf("Done.\n");       return 0;}int get_int(void){    int input;    char ch;       while (scanf("%d", &input) != 1)    {        while ((ch = getchar()) != '\n')            putchar(ch);  // dispose of bad input        printf(" is not an integer.\nPlease enter an ");        printf("integer value, such as 25, -178, or 3: ");    }       return input;}double sum_squares(int a, int b){    double total = 0;    int i;       for (i = a; i <= b; i++)        total += i * i;       return total;}bool bad_limits(int begin, int end, int low, int high){    bool not_good = false;        if (begin > end)    {        printf("%d isn't smaller than %d.\n", begin, end);        not_good = true;    }    if (begin < low || end < low)    {        printf("Values must be %d or greater.\n", low);        not_good = true;    }    if (begin > high || end > high)    {        printf("Values must be %d or less.\n", high);        not_good = true;    }          return not_good;}