10 因式分解 int main(){{ int i, n; scanf_s("%d", &n);//("%d\",&n) for (i = 2; i< n; i++) { printf("%d\n",i); while (n % i == 0)//while执行完之后 i还是从2开始 一直从2开始 { //printf("%d",i); n= n / i; }11//int main() 输入五个数求五个数相加求平均//{// int i = 0;// float n, sum=0;// for (i = 1; i <= 5; i++)// {// printf("enter %d number;",i);//%d就等于带入值同下printf// scanf_s("%f", &n);// sum = sum + n;// sum = sum / 5;// }// printf("sum=%f", sum);//}14 套用 类似于2+22+222+2222；a=2 b=2即可int main(){ int a, b, sum, i, n; sum = 0; printf("enter a and n:"); scanf_s("%d %d", &a, &n); b = 0; b = a; for (i = 1; i <= n; i++) { sum = sum + a; a = 10 * a +b; } printf("sum=%d", sum);}