我在这个程序中遇到了无效指针的问题(我很抱歉不得不提出整个错误的程序......)。
#include "stdafx.h"
void Input_int(int& InputVar, int Min = -2147483647, int Max = 2147483647);
void Output_array(void* Array, unsigned int ElementNumber, unsigned int Type = 0);
//Type = 0 => int, 1 => bool.
bool* Convert_decimal_to_binary(int n);
void main()
{
int n;
bool* binary;
Input_int(n, -255, 255);
binary = Convert_decimal_to_binary(n);
printf("Binary's address: %d\n", binary);
Output_array(binary, 8, 1);
}
void Input_int(int& InputVar, int Min, int Max)
{
do {
printf("Please input an integer in range [%d;%d]: ", Min, Max);
scanf_s("%u", &InputVar);
if (InputVar > Max || InputVar < Min) printf("Your number is out of the range!\n");
} while (InputVar > Max || InputVar < Min);
}
bool* Convert_decimal_to_binary(int n)
{
static bool Array[8];
bool finishplus = false;
if (n < 0)
{
int i;
for (i = 7; i >= 0; i--)
{
if (n % 2 == 0) Array[i] = 0;
else {
if (!finishplus)
{
Array[i] = 0;
finishplus = true;
}
else
Array[i] = 1;
}
n = n / 2;
}
}
else {
for (int i = 0; i < 8; i++)
{
if (n % 2 == 0) Array[i] = 0;
else Array[i] = 1;
n = n / 2;
}
}
return Array;
}
void Output_array(void* Array, unsigned int ElementNumber, unsigned int Type)
{
if (Type == 0)
{
int* ArrayR;
ArrayR = (int*)Array;
for (unsigned int i = 0; i < ElementNumber; i++)
printf("Element %d got value: %d\n", i, ArrayR[i]);
}
else if (Type == 1)
{
bool* ArrayR;
printf("Array's address (in Output_array) before type explicited: %d\n", Array);
ArrayR = (bool*)Array;
printf("Array's address (in Output_array) after type explicited: %d", Array);
for (unsigned int i = 0; i < ElementNumber; i++)
printf("%d", i, ArrayR[i]);
printf("\n");
}
}
这里的主要问题是这3行的输出:
printf("Binary's address: %d\n", binary);
printf("Array's address (in Output_array) before type explicited: %d\n", Array);
printf("Array's address (in Output_array) after type explicited: %d", Array);
为什么第三个输出与其他输出不同?
示例:
Binary的地址:11374900 类型说明之前的数组地址(在Output_array中):11374900 类型明确后的数组地址(在Output_array中):1137490001234567。
那里,"01234567"
总是出现。
提前致谢!
答案 0 :(得分:0)
您忘记了\n
上的printf
,因此它会附加您输出的下一个数字。指针本身很好。