c - 数字在用户输入的数字之前

Question

Ask user to enter a random number between 1 and 100. Then ask how many numbers s/he wants to display that precedes first number s/he enters.

if user enter 9 and wants 3 numbers that precedes 9, your program should display this:

6 7 8 9

我做不完

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


int main()
{
   int endnum, pre;


    printf("Enter a random number between 1 and 100: ");
    scanf("%d", &endnum);

    printf("how many numbers he wants to display that precedes first number you entered: ");
    scanf("%d", &pre);

    num = endnum - pre;
    printf (%d, num+1)
    num = num + 1
    while (num <= endnum)


    return 0;
}

Answer 1

你很接近。你有 pre 和 endnum。您只想从 pre 循环到 endnum(含)，然后打印出它们中的每一个。

如果愿意，您可以使用 while 循环，但对我来说，这种情况更适合使用 for 循环。像这样的东西:

for (num = endnum - pre; num <= endnum; ++num)
{
    printf("%d ", num);
}

其中 num 预先声明为 int。