Unable to understand a c code

Unable to understand a c code

I am studying c programming book by dennis M.Ritchie.I unable to
understand this code. please can any explain me this code?
#include <stdio.h>
main()
{
int c,i,nwhite,nother;
int ndigit[10];
nwhite=nother=0;
for(i=0;i<10;++i)
ndigit[i]=0;
while((c=getchar())!=EOF)
if(c>='0' && c<='9')
++ndigit[c-'0'];
else if(c==' ' || c=='\n' || c=='\t')
++nwhite;
else
++nother;
printf("digits =");
for(i=0;i<10;++i)
printf("%d",ndigit[i]);
printf(",white space=%d, other = %d\n",nwhite,nother);
}