What does this code do?

[AngelinaF2003]

char F10(char c[])
 { char m,z; int n,s,i;
   for (s=0,m='A'; m <='Z'; m++) {
              for (n=0, i=0; c[i] !='\0'; i++)
                           if (c[i]==m) n++;
                           if (n > s) { z=m; s=n; }
              }
 return z; }
 
 

[Rabbit]

You should come up with some example strings and step through it using pen and paper.

Some hints/offhand observations: the ifs can't be combined, the second if can be outside the inner loop, it would be more efficient to tabulate the results and get rid of the nested loops.