capitalze first letter of each sentence

#include <stdio.h>
#include <ctype.h>

int main()
{
        int ch;
        int broken = 1;
        ch = getchar();
        while(ch != EOF) {
                if(broken && isalpha(ch)) {
                        broken = 0;
                        putchar(toupper(ch));
                } else {
                        putchar(ch);
                }
                if(ch == '.' || ch == '\n' || ch == '\r') {
                        broken = 1;
                }
                ch = getchar();
        }
}