【C语言】任意整数转二进制字符串

 上网看到一个将任意整数转二进制字符串的代码，修改了一下，共享出来：

IDE为：DevCPP

#include <cstdlib>
#include <iostream>

using namespace std;



#define N 8
#define M 1<<(N-1)

#define ERR     (0)
#define OK      (1)



#define LOG_ERR(s)\
{\
    printf("line[%d], %s\n", __LINE__, s);\
    system("pause");\
}

typedef unsigned int UL;
typedef unsigned short US;
typedef unsigned char UC;



char inputFileName[] = "test.jpg";
char outputFileName[] = "output.txt";

char binaryBuff[N + 1];


void toBinaryString(UL num)
{
    int i;

    memset(binaryBuff, 0, N + 1);

    for (i=0; i<N ;i++)
    {
        if ((num&M)==0)
        {
            strcat(binaryBuff, "0");
        }
        else
        {
            strcat(binaryBuff, "1");
        }

        num<<=1;
    }
}




int main()
{
    FILE *inputFile = NULL;
    FILE *outputFile = NULL;

    char c = 0;


    inputFile = fopen(inputFileName, "rb");
    if (NULL == inputFile)
    {
        LOG_ERR("call fopen(inputFileName, \"rb\") failed!");
        return 0;
    }

    outputFile = fopen(outputFileName, "wb");
    if (NULL == inputFile)
    {
        LOG_ERR("call fopen(outputFileName, \"wb\") failed!");
        return 0;
    }

    while(c = fgetc(inputFile))
    {
        if (feof(inputFile))
        {
            break;
        }

        toBinaryString(c);

        fprintf(outputFile, "%s\n", binaryBuff);
    }

    fflush(outputFile);

    fclose(inputFile);
    fclose(outputFile);

    system("pause");
    return 0;
}