Project-Scylla/KNR C/ex1_13.c

#include <stdio.h>

#define IN 1 /*State when selected character is within a word*/
#define OUT 0 /*State when selected character is any kind of whitespace*/



int main(){

	int charCount[10]; /*Array for storing char lengths*/

	int last, lCount, state, i; /*last stores last character, or 0 at init. lCount increments every time the main for loop encounters a non-newline/whitespace character and then resets when one is encountered after commiting its value to charCount.*/
	/*Begin array initialization*/
	for(i = 0; i < 10; ++i){
		charCount[i] = 0;
		}
	/*End array init*/
	

	last = lCount = 0;
	
	/*Begin input letter count enumeration.*/
	for(int a = getchar(); a != EOF; a = getchar()){

		/*Check if current char is WS. If so, set state to OUT and check if the last character was not. If it was not, then we are exiting a word, and so comitting lCount to charCount.*/
		if(a == '\t' || a == ' ' || a == '\n'){ 
			state = OUT;
			if (last != '\t' && last != ' ' && last != '\n'){ /*True on word exit only.*/
				if(lCount > 10){ /*Array charCount only stores values up to 10, so we will add any longer words to the column for 10+*/
					++charCount[9]; /*Adding at position 11 in the array, since it starts at 0.*/
				} else {
					
					++charCount[(lCount - 1)]; /*This decrements to array position lCount-1 in order to use position 0 in the array as position 1 since there are no 0-letter words, thus saving 4 bytes in the stack by not needing an array 11 ints long*/
				}
				lCount = 0; /*Reset lCount when a condition that dumps it to charCount is triggered*/
			}

		} else { 
			state = IN;
			++lCount; /*Increment lCount when encountering a non-WS character.*/
			}
		last = a; 
		}
	/*Input letter count enumeration complete*/
	
	/*Print a table of the number of words encountered for each number of characters.*/
	printf("Word letter count composition:\n");

	/*Initialize table header*/
	for (i = 0; i <= 8; ++i)
		printf("%3d", (i + 1));
	printf ("%3s", "  10+\n"); /*10+ is printed as a special case on its own, since it is more than just a letter.*/

	/*Print the data in charCount numerically to a table.*/
	for (i = 0; i < 10; ++i)
		printf("%3d", charCount[i]);

	/*Print a histogram of gathered data.*/
	printf("\nHistogram of char counts by frequency of words enountered with a given count.\n");
	i = 0; /*Reset value of i, since we're reusing it*/
	for (int b = charCount[i]; i < 10; ++i){
		if (i < 9){
			printf("%d  ", (i + 1));
		} else if (i = 9){
			printf("%3s", "10+");
		}
		/*For loop with no entry condition that prints a | and then decrements b. TODO: Figure out a better way to do this that doesn't require cycling this loop b number of times.*/
		for (b > 0; b > 0; --b){
			printf("|");
		}
		printf("\n");
		b = charCount[(i + 1)]; /*Get the value of the next position in the array; since i hasn't incremented yet, it's i+1*/
	}
	return 0;
}