c++常见练习题下

//输出水仙花数

int main(){int i = 0;int j = 0;int k = 0;for (int m = 100; m < 1000; m++){i = m % 10;j = m /10 % 10;k = m / 100;if (i*i*i + j*j*j + k*k*k == m)printf("%d  ", m);}system("pause");return 0;}

//1234，输出4321

int main(){int num = 0;scanf("%d\n", &num);int key = 0;while (num){key = num % 10;printf("%d  ", key);num = num / 10;}system("pause");return 0;}

//输出1~100之间9的个数
int main(){int count = 0;for (int i = 1; i <= 100; i++){if (i % 10 == 9)count++;if (i / 10 == 9)count++;}printf("%d\n", count);system("pause");return 0;}