我留下了一些代码,但基本上我有一个小数数组,我试图将它转换成二进制数,但作为一个字符串数组。对C来说是全新的,现在真的是在抓救命稻草。我很不确定malloc和calloc是如何使用的。这是我试图让它对第一个数字/二进制字符串起作用的尝试:
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
void binstringconvert (unsigned long int *decimals, char **binarystrings);
int main (int argc, char **argv)
{
// initialize variables
int numLines = 9;
int binaryLength = 32;
unsigned long int decimals[numLines];
decimals[0] = 3241580200;
// convert decimal array to 32-bit binary string array
char **binarystrings = calloc (numLines, binaryLength);
binstringconvert(decimals, binarystrings);
// test print
printf("\n\n%lu in binary number system is: ", decimals[0]);
printf("\n%s", binarystrings[0]);
}
void binstringconvert (unsigned long int *decimals, char **binarystrings)
{
int c, k;
for (c = 31; c >= 0; c--)
{
k = decimals[0] >> c;
if (k & 1)
binarystrings[0][c] = '1';
else
binarystrings[0][c] = '0';
}
}
我是否正确初始化了
binarystrings
?我能像以前那样给每个人写信吗?现在它给了我一个错误。 最佳答案
很抱歉,我解释说您想向函数传递多个数字,并将它们全部转换为二进制字符串并返回。不管怎样,这个例子仍然有效。在这两种情况下,要将32位数字放入字符串,需要33个字符(nul终止字符为1)。另外,您正在以相反的顺序编写二进制字符串。
只要稍微调整一下就可以纠正顺序。例子:
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
enum { DWRD = 32 };
void binstringconvert (unsigned *decimals, char (*binarystrings)[DWRD+1], int n);
int main (void)
{
/* initialize variables */
unsigned int decimals[] = { 1, 255, 65535, 8388607,
3241580200, 2898560974,
4294967295, 3097295382,
1076482445, 1234567890 };
char (*binarystrings)[DWRD+1] = {NULL};
int i, n = sizeof decimals/sizeof *decimals;
binarystrings = calloc (n, sizeof *binarystrings);
binstringconvert (decimals, binarystrings, n);
/* test print */
for (i = 0; i < n; i++)
printf (" %10u : %s\n", decimals[i], binarystrings[i]);
free (binarystrings);
return 0;
}
void binstringconvert (unsigned *decimals, char (*binarystrings)[DWRD+1], int n)
{
int c, i, k;
for (i = 0; i < n; i++) {
for (c = 31; c >= 0; c--)
{
k = decimals[i] >> c;
if (k & 1)
binarystrings[i][31-c] = '1';
else
binarystrings[i][31-c] = '0';
}
binarystrings[i][DWRD] = 0; /* nul-terminate */
}
}
输出
$ ./bin/binstrings
1 : 00000000000000000000000000000001
255 : 00000000000000000000000011111111
65535 : 00000000000000001111111111111111
8388607 : 00000000011111111111111111111111
3241580200 : 11000001001101101001011010101000
2898560974 : 10101100110001001000011111001110
4294967295 : 11111111111111111111111111111111
3097295382 : 10111000100111001111101000010110
1076482445 : 01000000001010011101000110001101
1234567890 : 01001001100101100000001011010010