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| #include <stdio.h> #include <math.h> #include <stdlib.h>
int hcf(int a, int b) { if (b != 0) return hcf(b, a % b); else return a; }
int main() { int i, j, n, s; printf("enter 完数范围:"); scanf_s("%d", &n);
for (i = 2; i < n; i++) { s = 0; for (j = 1; j < i; j++) { if (!(i % j)) { s+=j; } } if (s == i) { printf("%d ", i); } } printf("\n------------------------------"); system("pause");
int a, b, c, count = 0; printf("100以内的勾股数\n"); printf(" a b c a b c\n");
for (a = 1; a < 101; a++) { for (b = a+1; b < 101; b++) { c = (int)sqrt(a * a + b * b); if (c * c == a * a + b * b && a + b > c && a + c > b && b + c > a && c < 101) { printf("%3d%3d%3d", a, b, c); count++; if (count % 2 == 0) { printf("\n"); } } } } printf("\n------------------------------"); system("pause");
int q, w, temp, e; printf("两个正整数的最大公约数(GCD):"); scanf_s("%d%d", &q, &w);
if (q > w) { temp = q; q = w; w = temp; }
for (e = q; e > 0; e--) { if (q % e == 0 && w % e == 0) { printf("%d", e); break; } } printf("\n------------------------------"); system("pause");
int a1, b1; scanf_s("%d%d", &a1, &b1); printf("两个正整数的最大公约数(GCD):%d", hcf(a1, b1));
printf("\n------------------------------"); system("pause");
int a3, b3; scanf_s("%d%d", &a3, &b3); a3 = (a3 > 0) ? a3 : -a3; b3 = (b3 > 0) ? b3 : -b3;
while (a3 != b3) { if (a3 > b3) { a3 -= b3; } else { b3 -= a3; } } printf("两个正整数的最大公约数(GCD):%d", a3);
printf("\n------------------------------"); system("pause");
int q1, w1, temp1, e1, s1; printf("两个正整数的最小公倍数(LCM):"); scanf_s("%d%d", &q1, &w1);
if (q1 < w1) { temp1 = w1; w1 = q1; q1 = temp1; }
for (s1 = 1;; s1++) { e1 = q1; e1 *= s1; if (e1 % q1 == 0 && e1 % w1 == 0) { printf("%d", e1); break; } }
printf("\n------------------------------"); system("pause");
int h, t, o, num; printf("water flower:");
for (num = 1; num < 1000; num++) { h = num / 100; t = num / 10 % 10; o = num % 10;
if (num == h * h * h + t * t * t + o * o * o) { printf("%d ", num); } }
return 0; }
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