记录下整型转换为32位二进制字符串的两种方式。
一、返回string 类型
char digits[] ={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};std::string ToBinaryString(int i){char buf[32] = {0 };//char buf[8] = { 0 };char* pBuf = buf;int charPos = 32;int radix = 1 << 1;int mask = radix - 1;do{pBuf[--charPos] = digits[i & mask]; // 与运算获取每次提取的数据i = i >> 1;} while (i != 0);std::string str;int strLen = 32 - charPos;int zeroLen = 0;while (zeroLen < charPos){str.push_back(48);zeroLen++;}pBuf = pBuf + charPos;while (strLen){str.push_back(*pBuf);pBuf++;strLen--;}return str;}
二、返回char* 类型
char digits[] ={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};char* ToBinaryString_Test(int i){char buf[32] = {0 };//char buf[8] = { 0 };char* pBuf = buf;int charPos = 32;int radix = 1 << 1; int mask = radix - 1;do{char a = digits[i & mask];pBuf[--charPos] = digits[i & mask]; // 与运算获取每次提取的数据i = i >> 1;} while (i != 0);// 需要在堆上分配空间。如果在栈上分配空间，函数执行完毕后，栈空间被释放，char* 指针指向的地址被释放后，会返回乱码。char* str = new char[33]{0 }; int strLen = 32 - charPos;int zeroLen = 0;for(int i = 0; i < charPos; i++){str[i] = 48;zeroLen++;}pBuf = pBuf + charPos;while (strLen){int a = (*pBuf);str[zeroLen] = (*pBuf);pBuf++;strLen--;zeroLen++;}str[32] = '\0';return str;}
