编程实现:把十进制数(long型)分别以二进制和十六进制形式输出,不能使用printf系列。
实现了unsigned long型的转换。
- // 十进制转换为二进制,十进制数的每1bit转换为二进制的1位数字
- char *int_to_bin(unsigned long data)
- {
- int bit_num = sizeof(unsigned long) * 8;
- char *p_bin = new char[bit_num+1];
- p_bin[bit_num] = '\0';
- for (unsigned int i = 0; i < bit_num; ++i)
- {
- p_bin[i] = data << i >> (bit_num-1);
- if (p_bin[i] == 0)
- p_bin[i] = '0';
- else if (p_bin[i] == 1)
- p_bin[i] = '1';
- else
- p_bin[i] = 'a';
- }
- return p_bin;
- }
- // 十进制转换为十六进制,十进制数的每4bit转换为十六进制的1位数字
- char *int_to_hex(unsigned long data)
- {
- int bit_num = sizeof(unsigned long) * 8;
- char *p_hex = new char[sizeof(unsigned long)*8/4+3];
- p_hex[0] = '0';
- p_hex[1] = 'x';
- p_hex[bit_num/4+2] = '\0';
- char *p_tmp = p_hex + 2;
- for (unsigned int i = 0; i < bit_num/4; ++i)
- {
- p_tmp[i] = data << (4*i) >> (bit_num-4);
- if (p_tmp[i] >= 0 && p_tmp[i] <= 9)
- p_tmp[i] += '0';
- else if (p_tmp[i] >= 10 && p_tmp[i] <= 15)
- p_tmp[i] = p_tmp[i] - 10 + 'A';
- }
- return p_hex;
- }