基本上,我想要我的代码执行的操作是将阶乘结果与输入的数字进行比较,以找到小于输入数字的最大阶乘。由于某种原因,它没有打印任何内容。
public class Main {
public static void main(String[] args) {
int numinput = 150; //number than we are trying to find the largest factorial less than
int num = 1; //number than we are solving a factorial for, to test against numinput
int factorial = 1; //actual result of the factorial
while (factorial < numinput) //finds the factorial of num
for(int i = 1; i <= num; i++) {
factorial *= i;
}
num++;
if (factorial > numinput) {
num--;
System.out.println("The largest factorial less than " + numinput + "is !" + factorial);
}
}
}
答案 0 :(得分:0)
while
循环没有花括号,因此循环体内唯一的东西是for
循环。 num
从1
开始,并且循环中的任何内容都不会增加循环,因此它将永远循环。
不过,您不需要嵌套循环-可以在运行时计算阶乘的单个循环就足够了:
int numinput = 150; //number than we are trying to find the largest factorial less than
int num = 1;
int factorial = 1;
while (factorial < numinput) {
num++;
factorial *= num;
}
// We overshot to terminate the loop, go back one number
factorial /= num;
num--;
System.out.println
("The largest factorial less than " + numinput + " is " + num + "!, or " + factorial);
答案 1 :(得分:0)
那是因为您的代码在循环时无法摆脱困境-
while (factorial < numinput) //finds the factorial of num
for(int i = 1; i <= num; i++) {
factorial *= i;
}
由于在while循环中没有使用括号,所以它刚好是for循环,并且由于num
的值从不增加,因此它将factorial
永远乘以1。我想您想这样做-
public class Main {
public static void main(String[] args) {
int numinput = 150; //number than we are trying to find the largest factorial less than
int num = 1; //number than we are solivng a factorial for, to test agaisnt numinput
int factorial = 1; //actual result of the factorial
while (factorial < numinput) {
for(int i = 1; i <= num; i++) {
factorial *= i;
}
num++;
if (factorial > numinput) {
num--;
System.out.println("The largest factorial less than " + numinput + "is !" + factorial);
}
}
}
}
但是我检查了代码的输出是否为150,这是不正确的。我在下面提供我的代码-
public class Main {
public static void main(String[] args) {
int numinput = 150; //number than we are trying to find the largest factorial less than
int num = 1; //number than we are solivng a factorial for, to test agaisnt numinput
int factorial = 1; //actual result of the factorial
while (factorial <= numinput) { // continue multiplying even if equal
factorial = 1;
for(int i = 1; i <= num; i++) {
factorial *= i;
}
num++;
}
// now the factorial is surely greater than numinput, and it is the factorial of
// current value of num - 1, we can remove the conditional
// and reduce the factorial by num -1 since multiplying by num - 1 has
// made it bigger than numinput
factorial /= (num - 1);
System.out.println("The largest factorial less than " + numinput + "is !" + factorial);
}
}
答案 2 :(得分:0)
我假设您是说小于输入的阶乘的最小整数阶乘。因此,代码应如下所示:
public static void main(String[] args) {
int input = 150; // example
for (int i = 1; i <= input - 1; i++) {
int sum = (input - 1) * 1;
}
System.out.println(input);
}