C++从任意进制的数转换成另外一个指定进制的数
例如,从2进制转换成10进制,8进制转换成16进制等
#include <iostream> #include <string> std::string conv(std::string number, int startBase, int endbase); long long power(int num, int pow); int main(void){ std::string binary = "11010010"; std::cout << "Start Base: Binary (" << binary << ")" << std::endl; std::cout << "Octal:\t\t" << conv(binary, 2, 8) << std::endl; std::cout << "Decimal:\t" << conv(binary, 2, 10) << std::endl; std::cout << "Hexadecimal:\t" << conv(binary, 2, 16) << std::endl << std::endl; std::string octal = "81"; std::cout << "Start Base: Octal (" << octal << ")" << std::endl; std::cout << "Binary:\t\t" << conv(octal, 8, 2) << std::endl; std::cout << "Decimal:\t" << conv(octal, 8, 10) << std::endl; std::cout << "Hexadecimal:\t" << conv(octal, 8, 16) << std::endl << std::endl; std::string decimal = "41"; std::cout << "Start Base: Decimal (" << decimal << ")" << std::endl; std::cout << "Binary:\t\t" << conv(decimal, 10, 2) << std::endl; std::cout << "Octal:\t\t" << conv(decimal, 10, 8) << std::endl; std::cout << "Hexadecimal:\t" << conv(decimal, 10, 16) << std::endl << std::endl; std::string hexadecimal = "A9"; std::cout << "Start Base: Hexadecimal (" << hexadecimal << ")" << std::endl; std::cout << "Binary:\t\t" << conv(hexadecimal, 16, 2) << std::endl; std::cout << "Octal:\t\t" << conv(hexadecimal, 16, 8) << std::endl; std::cout << "Decimal:\t" << conv(hexadecimal, 16, 10) << std::endl << std::endl; return 0; } std::string conv(std::string number, int startBase, int endBase){ if(startBase > 16 || endBase > 16) return "BASE ERROR"; char NUMS[] = "0123456789ABCDEF"; std::string result = ""; int temp = 0, x; bool found = false; for(int i = 0; i < number.length(); i++){ for(x = 0; x < startBase; x++){ if(NUMS[x] == number[number.length()-(i+1)]){ found = true; break; } } if(!found) return "NUMBER ERROR"; temp += (x*power(startBase, i)); } do{ result.push_back(NUMS[temp%endBase]); temp /= endBase; }while(temp != 0); return std::string(result.rbegin(), result.rend()); } long long power(int num, int pow){ if(pow == 0) return 1; return num*power(num, pow-1); }