为什么我的指针整型数组的工作？ [英] Why aren't my pointers to integer arrays working?

问题描述

下面的问题是： http://cps125.scs.ryerson.ca/labs /homework8.gif

下面是我的尝试：

#include <stdio.h>

void tenfold(int (*array1)[9], int (*array2)[9])
{
    int i;
    for (i = 0; i < 9; i++) {
        if ((*array1)[i] > 0) {
            (*array2)[i] = 10 * (*array1)[i];
        } else {
            (*array2)[i] = (*array1)[i];
        }
    }
}

int main()
{
    int array1[9] = { 3, 4, 5, 6, 7, -8, -9, 1, 2 }, array2[9], i;

    tenfold(&array1, &array2);

    for (i=0; i < 9; i++) {
        printf("%lf ", array2[i]);
    }
    return 0;
}

下面是输出：

44100667367791664000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000.000000 441006673677917200000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000.000000 4410066736779177
60000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000.000000 4410066736779183200000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000.000000 44100667367791888000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000.000000
44100691391845304000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000.000000 441006913918452980000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000.000000 4410066736779155
20000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000.000000 4410066736779160800000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000.000000

44100667367791664000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000.000000 441006673677917200000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000.000000 4410066736779177 60000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000.000000 4410066736779183200000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000.000000 44100667367791888000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000.000000 44100691391845304000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000.000000 441006913918452980000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000.000000 4410066736779155 20000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000.000000 4410066736779160800000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000000000000000000000000000000000000000000000000000000000000000000000 0000000000000000000000000000000000000000.000000

推荐答案

有至少这里有一个问题：

There is at least a problem here:

printf("%lf ", array2[i]);

％LF 的字面意思是长漂，但是要打印整数：

%lf literally means "long float", however you want to print integers:

printf("%i\n", array2[i]);

还记得为的printf的等待\\ n 刷新。

编辑：newacct指出，％F 和％LF 都是双到底，因为可变参数促进浮动到双击。

As newacct pointed out, %f and %lf are both double in the end, since varargs promote float to double.

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