Why is this loop stuck in an infinite loop?

// Prime Read of First Character

inFile.get(ch);

while(inFile.good())

{

// Line Count

linecount = 0;

linecount++;

letters = 0;

digits = 0;

other = 0;

while(ch != ' ')

{

// Letter Count

if(isalpha(ch))

letters++;

// Digit Count

else if(isdigit(ch))

digits++;

// Other Count

else //(!isalpha(ch) && !isdigit(ch));

other++;

inFile.get(ch);

}

// Total

linetotal = letters + digits + other;

other++;

cout << left << setw(15) << linecount << setw(10) << letters << setw(10) << digits <<

setw(10) << other << setw(10) << linetotal << endl;

// Totals for each Column

totallet += letters;

totaldig += digits;

totaloth += other;

totals = totallet + totaldig + totaloth;

// Percent

percentlet = (float)totallet / (float)totals;

percentdig = (float)totaldig / (float)totals;

percentoth = (float)totaloth / (float)totals;

}