写出一个程序,接受一个十六进制的数,输出该数值的十进制表示。
数据范围:保证结果在
#include<stdio.h> #include<string> #include<iostream> #include<set> #include<math.h> using namespace std; //定义一个sum,每一位等于temp*16^(str.length()-i) int main(){ string strs; while(getline(cin,strs)){ int sum=0; int temp=0; for(int i=strs.length()-1;i>0;i--){ if(strs[i]=='x') break; if(strs[i]>='A'&&strs[i]<='J'){ temp = strs[i]-55; temp = temp*pow(16,strs.length()-i-1); } else{ temp = strs[i]-48; temp = temp*pow(16,strs.length()-i-1); } sum = sum+temp; } cout<<sum<<endl; } }
package main import ( "fmt" "os" "bufio" "strconv" ) func main(){ input := bufio.NewScanner(os.Stdin) for input.Scan(){ v, _ := strconv.ParseInt(input.Text(), 0, 64) fmt.Println(v) } }
#include<iostream> using namespace std; //十进制 dec //十六进制:hex //八进制:oct int main() { int a; while(cin>>hex>>a) //读入六进制 { cout<<a; cout<<endl; } return 0; }
#include<iostream> #include<cmath> using namespace std; int main(){ string s,str="0123456789ABCDEF"; while(getline(cin,s)){ int k=1, sum=0,pos; for(int i=s.size()-1;i>1;i--){ pos=str.find(s[i]); // sum+=(pos*pow(16.0,k)); // k++; sum+=(pos*k); k*=16; } cout<<sum<<endl; } }
#include <bits/stdc++.h> using namespace std; typedef long long ll; ll XToDec(string s,ll x) { //将给定的x进制字符串s转换成10进制 ll ans = 0; for(ll i = 0; i < s.length(); i++) { ans = ans*x + (isdigit(s[i]) ? s[i]-'0' : s[i]-'A'+10); } return ans; } int main() { ios::sync_with_stdio(false); cin.tie(0),cout.tie(0); string s; while(cin >> s) { s = s.substr(2,s.length()-2); cout << XToDec(s,16) << endl; } return 0; }
#include<iostream> (720)#include<string.h> #include<math.h> using namespace std; int main(){ char s[1000]; while(gets(s)){ int m=0,sum=0; int len=strlen(s); for(int i=len-1;i>=0;i--){ if(s[i]>='0'&&s[i]<='9') sum=sum+(s[i]-'0')*pow(16,m); else if(s[i]>='A'&&s[i]<='F') sum=sum+(s[i]-'A'+10)*pow(16,m); else if(s[i]>='a'&& s[i]<='f') sum=sum+(s[i]-'a'+10)*pow(16,m); m++; } cout<<sum<<endl; } }
while True: try: a = input() print(eval(a)) except: break
//同不知道考察什么,这个进制转化蛮简单的,就是注意一下switch不要把break忘记了 #include<iostream> #include<cstring> #include<algorithm> using namespace std; int main(){ char a[20],b[20]; while(cin>>a){ int len=strlen(a),total=0; for(int i=len-1;i>1;i--) b[len-i-1]=a[i]; for(int i=0;i<len-2;i++) switch(b[i]){ case '0': total+=0*pow(16,i);break; case '1': total+=1*pow(16,i);break; case '2': total+=2*pow(16,i);break; case '3': total+=3*pow(16,i);break; case '4': total+=4*pow(16,i);break; case '5': total+=5*pow(16,i);break; case '6': total+=6*pow(16,i);break; case '7': total+=7*pow(16,i);break; case '8': total+=8*pow(16,i);break; case '9': total+=9*pow(16,i);break; case 'A': total+=10*pow(16,i);break; case 'B': total+=11*pow(16,i);break; case 'C': total+=12*pow(16,i);break; case 'D': total+=13*pow(16,i);break; case 'E': total+=14*pow(16,i);break; case 'F': total+=15*pow(16,i);break; } cout<<total<<endl; } return 0; }
#include<iostream> #include<string> #include<algorithm> using namespace std; int main() { int arr[200]; arr['0'] = 0; arr['1'] = 1; arr['2'] = 2; arr['3'] = 3; arr['4'] = 4; arr['5'] = 5; arr['6'] = 6; arr['7'] = 7; arr['8'] = 8; arr['9'] = 9; arr['A'] = 10; arr['B'] = 11; arr['C'] = 12; arr['D'] = 13; arr['E'] = 14; arr['F'] = 15; string ss; static int sum = 0; while (getline(cin, ss)) { sum = 0; for (int i = ss.size() - 1,j = 0; i >= 2; i--,j++) { sum += arr[ss[i]] * pow(16, j); } cout << sum << endl; } return 0; }
import java.util.*; public class Main { /** * 字符转10进制整数 * @param c 16进制中的字符 * @return 16进制转换十进制后的整数值 */ private static int char2Int(char c) { if (c >= '0' && c <= '9') { return c - '0'; } else { return (c - 'A') + 10; } } /** * * @param hexStr 16进制转10进制 * @return 返回十进制整数 */ private static long hex2bin(String hexStr) { long res = 0; for(int i = 0; i < hexStr.length(); i++) { res *= 16; res += char2Int(hexStr.charAt(i)); } return res; } public static void main(String args[]) { Scanner in = new Scanner(System.in); while (in.hasNext()) { String line = in.nextLine(); long res = hex2bin(line.substring(2)); System.out.println(res); } } }
import java.util.Scanner; public class Main { public static long hexToDec(String str){ String[] list = str.split("0x"); boolean isNegative =false; if(list[0].equals("-")){ isNegative = true; } String temp = list[1]; int flag =0; long num=0; for (int i = temp.length()-1; i >=0 ; i--) { if(temp.substring(i, i+1).equalsIgnoreCase("F")){ num += (int)15*Math.pow(16,flag); flag++; }else if(temp.substring(i, i+1).equalsIgnoreCase("E")){ num += (int)14*Math.pow(16,flag); flag++; }else if(temp.substring(i, i+1).equalsIgnoreCase("D")){ num += (int)13*Math.pow(16,flag); flag++; }else if(temp.substring(i, i+1).equalsIgnoreCase("C")){ num += (int)12*Math.pow(16,flag); flag++; }else if(temp.substring(i, i+1).equalsIgnoreCase("B")){ num += (int)11*Math.pow(16,flag); flag++; }else if(temp.substring(i, i+1).equalsIgnoreCase("A")){ num += (int)10*Math.pow(16,flag); flag++; }else{ num += (int)Integer.parseInt(temp.substring(i, i+1))*Math.pow(16,flag); flag++; } } if(isNegative){ return -num; } return num; } public static void main(String[] args) { Scanner sc = new Scanner(System.in); while (sc.hasNext()){ String str = sc.next(); // System.out.println(Integer.decode(str)); System.out.println(hexToDec(str)); } } }
#include<iostream> #include<string> #include<math.h> using namespace std; int main() { string str; while(cin>>str){ int len=str.size(); int s=0; int a; for(int i=len-1;i>1;i--) { if(int(str[i])>60) { a=(str[i]-55)*pow(16,len-1-i); } else { a=(int(str[i]-48))*pow(16,len-1-i); } s=s+a; } cout<<s<<endl; } return 0; }
import java.util.Scanner; public class Main{ public static void main(String[] args) { Scanner sc= new Scanner(System.in); while (sc.hasNext()) { String str=sc.nextLine(); int len=str.length()-2; int num=0; int y=0; for(int i=str.length()-1;i>=2;i--) { if(str.charAt(i)=='A')num+=10*toten(y); else if(str.charAt(i)=='B')num+=11*toten(y); else if(str.charAt(i)=='C')num+=12*toten(y); else if(str.charAt(i)=='D')num+=13*toten(y); else if(str.charAt(i)=='E')num+=14*toten(y); else if(str.charAt(i)=='F')num+=15*toten(y); else num+=Integer.parseInt(String.valueOf(str.charAt(i)))*toten(y); y++; } System.out.println(num); } } public static int toten(int a) { int x=1; if (a==0) return x; for (int i = 0; i < a; i++) { x*=16; } return x; } }
public static String str0xToDecimalSystem(String str0x0){ int sum = 0; int length = str0x0.length(); String str0x = str0x0.substring(2, length); length -=2; for(int i=0; i<length; i++){ // 从低位遍历字符 char place = str0x.charAt(length - i -1); // 当前位的字符数字 int placeNum; if ('A' <= place && place <= 'F') { placeNum = place - 'A' + 10; } else { placeNum = Integer.parseInt(String.valueOf(place)); } // 按权相加 placeNum *= Math.pow(16, i); sum += placeNum; } return String.valueOf(sum); }