Note.ms

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
long long toDecimal(const string &numStr,int base) {
	long long res=0;
	for(int i=0; i<numStr.size(); i++) {
		char c=numStr[i];
		int val;
		if(c>='0'&&c<='9')val=c-'0';
		else if(c>='A'&&c<='F')val=c-'A'+10;
		else if(c>='a'&&c<='f')val=c-'a'+10;
		else {
			cout<<"非法字符！"<<endl;
			return -1;
		}
		if(val>=base) {
			cout<<"数字超出该进制允许范围！"<<endl;
			return -1;
		}
		res=res*base+val;
	}
	return res;
}
string fromDecimal(long long dec,int base) {
	if(dec==0)return "0";
	string table="0123456789ABCDEF";
	string ans;
	while(dec>0) {
		ans+=table[dec%base];
		dec/=base;
	}
	reverse(ans.begin(),ans.end());
	return ans;
}
int main() {
	int srcBase,destBase;
	string number;
	cout<<"=====进制转换工具(支持2,8,10,16进制)=====\n";
	cout<<"请输入原进制(2/8/10/16): ";
	cin>>srcBase;
	cout<<"请输入目标进制(2/8/10/16): ";
	cin>>destBase;
	cout<<"请输入待转换数字：";
	cin>>number;
	int bases[]= {2,8,10,16};
	bool srcOk=false,dstOk=false;
	int len=sizeof(bases)/sizeof(bases[0]);
	for(int i=0; i<len; i++) {
		int b=bases[i];
		if(b==srcBase)srcOk=true;
		if(b==destBase)dstOk=true;
	}
	if(!srcOk||!dstOk) {
		cout<<"错误：只支持2、8、10、16进制！"<<endl;
		return 1;
	}
	long long decNum=toDecimal(number,srcBase);
	if(decNum==-1)return 1;
	string result=fromDecimal(decNum,destBase);
	cout<<"\n转换结果："<<result<<endl;
	return 0;
}

Note.ms/nuse