c++ 如何寻找一串字符里的ASCII最小值并Output这个ASCII？

#include<iostream.h>
#include<string>
void main()
{
char s;
char result='z';
while((s=getchar())!='\n')
{
if (s<result)
result=s;
}
cout<<result<<endl;
}

#include<iostream>
#include<string>
#include<algorithm>

using std::cout;
using std::cin;
using std::endl;
using std::string;
using std::sort;

int main()
{
string s;
cin>>s;
sort(s.begin(),s.end());
cout<<"ASCII最小的字符:"<<s.at(0)<<endl;
cout<<"ASCII值:"<<int(s.at(0))<<endl;
return EXIT_SUCCESS;
}

#include<stdio.h>
#include<string.h>

void main()
{ char s[20]="bcdaBCDA",temp='z';
int i=0;
for(i=strlen(s)-1;i>=0;i--)
if(s[i]<temp) temp=s[i];
prin