Question

我刚刚制作了一个计算int-interval中整数阶乘的程序。我还插入了一个while循环，因此它会一直运行。

但是我因为这个循环而遇到了问题：例如，如果我第一次输入数字5，我得到输出120，这是好的，因为5！= 120。但是第二次输入5时，我得到了一个完全相同的数字（在2.尝试时，所有数字都是相同的情况）。我认为这是因为我的计划一直在保存“因子”的价值。或循环计数器＆＃39; c＆＃39;。

所以我基本上需要在每次计算阶乘后重置两个变量，但我不知道要重置这个变量！

这是我的代码：

int main(void) {    

    uart_init(); // open the communication to the microcontroller
    io_redirect(); // redirect input and output to the uart

    int number; 
    int c;
    int factorial=1;

    while(1){
        printf("Please enter an integer to calculate its factorial:\n");
        scanf("%d", &number);       //Our input number is stored in the variable 'number'

        for (c=1; c<=number;++c)    //The variable 'c' is incremented by 1, until it equals 'number' (input)
            factorial=factorial*c;  //Every time 'c' is incremented by 1, it is multiplied with 'factorial' which initially is 1. 

        printf("Factorial of %d is %d\n\n\n", number, factorial);   //The factorial is printed.
    }
    return(0);
}

Answer 1

添加

factorial = 1;

在while循环结束时。

Answer 2

您需要在循环内重置factorial。

Answer 3

您重新使用factorial而不重新初始化它。您需要在while循环开始时将其设置为1。

Answer 4

放

int factorial=1;

在while循环内。

while(1){
    // Reset factorial by 1
    int factorial=1; 
    printf("Please enter an integer to calculate its factorial:\n");
    scanf("%d", &number);      
    for (c=1; c<=number;++c)   
        factorial = factorial*c;  

    printf("Factorial of %d is %d\n\n\n", number, factorial);   
}

Answer 5

在while循环中添加factorial = 1，因此while循环的主体如下所示：

while(1){
printf("Please enter an integer to calculate its factorial:\n");
scanf("%d", &number);       //Our input number is stored in the variable 'number'

for (c=1; c<=number;++c)    //The variable 'c' is incremented by 1, until it equals 'number' (input)
    factorial=factorial*c;  //Every time 'c' is incremented by 1, it is multiplied with 'factorial' which initially is 1. 

printf("Factorial of %d is %d\n\n\n", number, factorial);   //The factorial is printed.
factorial = 1;
}

不正确的因子计算

5 个答案: