在C中将整数转换为二进制 [英] Converting an integer to binary in C

问题描述

我正在尝试将整数10转换为二进制数1010.

I'm trying to convert an integer 10 into the binary number 1010.

此代码尝试了此操作，但是我在strcat()上遇到了段错误:

This code attempts it, but I get a segfault on the strcat():

int int_to_bin(int k)
{
   char *bin;

   bin = (char *)malloc(sizeof(char));
   while(k>0) {
      strcat(bin, k%2);
      k = k/2;
      bin = (char *)realloc(bin, sizeof(char) * (sizeof(bin)+1));
   }
   bin[sizeof(bin)-1] = '\0';

   return atoi(bin);
}

如何在C语言中将整数转换为二进制?

How do I convert an integer to binary in C?

推荐答案

如果要将数字转换为另一个数字(而不是数字转换为字符串)，则可以在较小的范围内实现(0到1023用于实现)使用32位整数)，则无需在解决方案中添加char*

If you want to transform a number into another number (not number to string of characters), and you can do with a small range (0 to 1023 for implementations with 32-bit integers), you don't need to add char* to the solution

unsigned int_to_int(unsigned k) {
    if (k == 0) return 0;
    if (k == 1) return 1;                       /* optional */
    return (k % 2) + 10 * int_to_int(k / 2);
}

HalosGhost 建议将代码压缩为一行

HalosGhost suggested to compact the code into a single line

unsigned int int_to_int(unsigned int k) {
    return (k == 0 || k == 1 ? k : ((k % 2) + 10 * int_to_int(k / 2)));
}

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