Base conversion summary
Convert decimal number to K-base number:
string changetentok(long long num,int k){
while(num!=0){
int temp=num%k;
num=num/k;
if(temp<=9&&temp>=0)
s.push_back(temp+'0');
else s.push_back(temp-10+'A');
}
reverse(s.begin(),s.end());
return s;
}Converting a base-k number to base-10:
int changektoten(string str,int k){
long long ans=0;
for(int i=0;i<str.length();i++){
if(str[i]>='0'&&str[i]<='9')ans=ans*k+(str[i]-'0');
else ans=ans*k+(str[i]-'A'+10);
}
return ans;
}Bluebridge past test questions calculator (hex conversion + simulation)**
topic:
answer:
#include<iostream>
#include<stdio.h>
#include<algorithm>
using namespace std;
long long change_num_k(string str,int k){
long long ans=0;
for(int i=0;i<str.length();i++){
if(str[i]>='0'&&str[i]<='9') ans=ans*k+(str[i]-'0');
else ans=ans*k+(str[i]-'A'+10);
}
return ans;
}
string getans(long long num,int k){
if(num==0)return "0";
string ans;
while(num){
int temp=num%k;
if(temp>9)
{
ans.push_back(temp-10+'A');
}
else {
ans.push_back(temp+'0');
}
num/=k;
}
reverse(ans.begin(),ans.end());
return ans;
}
long long calculator(long long a,long long b,int t){
if(t==1)return a+b;
if(t==2)return a-b;
if(t==3)return a*b;
if(t==4)return a/b;
if(t==5)return a%b;
}
int main(){
int n,k=10;
string str,op;
int t=0;
int flag=0;
long long num=0;
scanf("%d",&n);
while(n--){
cin>>op;
//scanf("%s",&op);
if(op=="NUM"){
//scanf("%d",&str);
cin>>str;
if(flag){
num=calculator(num,change_num_k(str,k),t);
}
else{
num=change_num_k(str,k);
flag=1;
}
}
else if(op=="CHANGE"){
scanf("%d",&k);
}
else if(op=="CLEAR"){
flag=0;
}
else if(op=="ADD"){
t=1;
}
else if(op=="SUB"){
t=2;
}
else if(op=="MUL"){
t=3;
}
else if(op=="DIV"){
t=4;
}
else if(op=="MOD"){
t=5;
}
else if(op=="EQUAL"){
cout<<getans(num,k)<<endl;
}
}
return 0;
}