commenting a c program on word histogram

Hi, I just want to explain me this program by commenting on it. ## Deliverables /* This program was the subject of a thread in comp.lang.c, because of the way it handled EOF. * The complaint was that, in the event of a text file's last line not ending with a newline, * this program would not count the last word. I objected somewhat to this complaint, on the * grounds that "if it hasn't got a newline at the end of each line, it isn't a text file". * * These grounds turned out to be incorrect. Whether such a file is a text file turns out to * be implementation-defined. I'd had a go at checking my facts, and had - as it turns out - * checked the wrong facts! (sigh) * * It cost me an extra variable. It turned out that the least disturbing way to modify the * program (I always look for the least disturbing way) was to replace the traditional * while((c = getchar()) != EOF) with an EOF test actually inside the loop body. This meant * adding an extra variable, but is undoubtedly worth the cost, because it means the program * can now handle other people's text files as well as my own. As Ben Pfaff said at the * time, "Be liberal in what you accept, strict in what you produce". Sound advice. * * The new version has, of course, been tested, and does now accept text files not ending in * newlines. * * I have, of course, regenerated the sample output from this program. Actually, there's no * "of course" about it - I nearly forgot. */ #include <stdio.h> #define MAXWORDLEN 10 int main(void) { int c; int inspace = 0; long lengtharr[MAXWORDLEN + 1]; int wordlen = 0; int firstletter = 1; long thisval = 0; long maxval = 0; int thisidx = 0; int done = 0; for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++) { lengtharr[thisidx] = 0; } while(done == 0) { c = getchar(); if(c == ' ' || c == '\t' || c == '\n' || c == EOF) { if(inspace == 0) { firstletter = 0; inspace = 1; if(wordlen <= MAXWORDLEN) { if(wordlen > 0) { thisval = ++lengtharr[wordlen - 1]; if(thisval > maxval) { maxval = thisval; } } } else { thisval = ++lengtharr[MAXWORDLEN]; if(thisval > maxval) { maxval = thisval; } } } if(c == EOF) { done = 1; } } else { if(inspace == 1 || firstletter == 1) { wordlen = 0; firstletter = 0; inspace = 0; } ++wordlen; } } for(thisval = maxval; thisval > 0; thisval--) { printf("%4d | ", thisval); for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++) { if(lengtharr[thisidx] >= thisval) { printf("* "); } else { printf(" "); } } printf("\n"); } printf(" +"); for(thisidx = 0; thisidx <= MAXWORDLEN; thisidx++) { printf("---"); } printf("\n "); for(thisidx = 0; thisidx < MAXWORDLEN; thisidx++) { printf("%2d ", thisidx + 1); } printf(">%d\n", MAXWORDLEN); return 0; } Please explain me the above program by commenting on it. ## Platform OS: windows(any version) xp,98,95,2000,NT Software: Turbo C