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#include<bits/stdc++.h>
using namespace std;
 
 
char max_count(char *str)
{
 
   int count[256] = {0};
 
   int len = strlen(str);
   int max = 0;
   char result;
   for (int i = 0; i < len; i++) { 
        count[str[i]]++; 
        if (max < count[str[i]]) { 
            max = count[str[i]]; 
            result = str[i]; 
        } 
    } 
 
	return result;
 
}
int main() {
 
   string str;
   cin>>str;
 
   cout<<max_count(str);
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:29:20: error: cannot convert ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’} to ‘char*’
    cout<<max_count(str);
                    ^~~
prog.cpp:5:22: note:   initializing argument 1 of ‘char max_count(char*)’
 char max_count(char *str)
                ~~~~~~^~~

Standard output is empty