Question

我正在为学校实验室在C中创建斐波那契序列生成器，但它不能成为0 1 1 2 3 5等常规方法......该程序应该是询问用户是否有限制，以及2个数字并从那里生成序列。

这是我到目前为止所做的：

#include <stdio.h>
#include <stdlib.h>
int main(void) 
{
    int num1, num2, num3, limit;
    int Fibarray[10];
    //Ask the user for a limit to the number of values displayed, checks to see if value is greater
    // than 10 or less than 0, if so displays an error message  
    printf("Please enter limit of values generated, the limit must be 10 or less, but greater than 0\n");
    scanf ("%i", &limit);
    if (limit > 10)
    {
        printf("Please enter a valid integer greater than 0, and less than or equal to 10");
    }
    else    
        printf("Please enter 2 numbers separated by a space, the second number must be larger than the first"); 
    scanf ("%i", &num1, &num2);
    if (num1>num2||num1<0)
    {
        puts("Please re enter your numbers, make sure they are in ascending order & the second number is greater than 0");
        return(15); 
    }
    else
    {
        // ...
    }
}

我想弄清楚的是，我如何将这两个值加在一起，存储在数组中，然后再次添加到限制中。

我认为这个问题与How to generate Fibonacci series in C不同，因为在这个程序中我需要接受用户的值，而不是预设值。

我一直在查看我的书，但这不是很有用。

Answer 1

关于：

scanf ("%i", &num1, &num2);

这将导致编译器输出警告消息，并且永远不会设置变量num2。建议：

size_t num1;
size_t num2;

....

if( 2 != scanf( "%lu %lu", &num1, &num2 ) ) 
{ 
    fprintf( stderr, "scanf for num1, num2 failed\n" );
    exit( EXIT_FAILURE ); 
}

Answer 2

要打印序列，请执行以下步骤：

输出a，即printf
将下一个数字c计算为a和b的总和
更新对：a = b，b = c。
迭代limit次。

关于您的代码，这是一个带有更严格的输入检查的改进版本：

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    int num1, num2, num3, limit;

    //Ask the user for a limit to the number of values displayed, checks to see if value is greater
    // than 10 or less than 0, if so displays an error message  
    printf("Please enter limit of values generated, the limit must be 10 or less, but greater than 0:\n");
    if (scanf("%i", &limit) != 1 || limit <= 0 || limit > 10) {
        printf("Please enter a valid integer greater than 0, and less than or equal to 10\n");
        return 1;
    }
    printf("Please enter 2 numbers separated by a space, the second number must be larger than the first:\n");
    if (scanf("%i%i", &num1, &num2) != 2 || num1 > num2) {
        puts("Please re enter your numbers, make sure they are in ascending order\n");
        return 2; 
    }
    // ...
}

在C中创建Fibonacci序列

2 个答案: