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//验证输入#include#include//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 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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