add comments bc i will forget what's going on

The C Programming Language/1.10.c

@@ -3,6 +3,8 @@
 #define PRINT 0
 #define SKIP  1
 
+// printing control chars
+
 main()
 {
 	int c;

The C Programming Language/1.11.c

@@ -3,6 +3,10 @@
 #define IN 1
 #define OUT 0
 
+// counting words from getstream,
+// doesn't work with backspace
+// (by design)
+
 main()
 {
 	int c, nl, nw, nc, state;

The C Programming Language/1.12.c

@@ -3,6 +3,8 @@
 #define IN 1
 #define OUT 0
 
+// converting input string to one word per line
+
 main()
 {
 	int c, state, word_ending;

The C Programming Language/1.13.c

@@ -2,6 +2,8 @@
 
 #define MAX_AMOUNT_OF_LENGTHS 256
 
+// drawing chart of words lengths
+
 main()
 {
 	int c, i, j;

The C Programming Language/1.14.c

@@ -2,6 +2,8 @@
 
 #define MAX_AMOUNT_OF_LENGTHS 256
 
+// drawing chart of chars usage
+
 main()
 {
 	int c, i, j;

The C Programming Language/1.15.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// creating a function to convert celsius to fahrenheit
+
 double to_fahr(double celsius)
 {
 	return (celsius * 9.0 / 5.0) + 32.0;

The C Programming Language/1.16.c

@@ -2,6 +2,9 @@
 
 #define MAXLINE 10
 
+// forcing getline to output actual amount of characters
+// from input even if it exceedes MAXLINE boundary
+
 int _getline(char line[], int maxline);
 void copy(char to[], char from[]);
 

The C Programming Language/1.17.c

@@ -5,6 +5,8 @@
 #define MAXTEXT 3000
 #define SELECTION_LENGTH 10
 
+// output all strings that are longer than MAXLINE
+
 int _getline(char line[], int maxline);
 int copy(char to[], int head, char from[]);
 

The C Programming Language/1.18.c

@@ -5,6 +5,8 @@
 int _getline(char line[], int maxline);
 void trim(char to[], char from[], int from_head);
 
+// remove all extra spaces and tabs from tail of input
+
 main()
 {
 	char line[MAXLINE];

The C Programming Language/1.19.c

@@ -5,6 +5,8 @@
 int _getline(char line[], int maxline);
 void reverse(char to[], char from[], int from_head);
 
+// reversing input string
+
 main()
 {
 	int len;

The C Programming Language/1.20.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// replacing tabs with spaces so it keeps indentation 
+
 int _getline(char s[], int lim)
 {
 	int c, i, j;

The C Programming Language/1.21.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// replacing empty strings consisting of only spaces
+// to tabs and spaces so it keeps initial indentation
 
 int _getline(char s[], int lim)
 {

The C Programming Language/1.3.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// converting Fahrenheit to Celsius
+
 main()
 {
 	float fahr, celsius;

The C Programming Language/1.4.c

@@ -1,5 +1,6 @@
 #include <stdio.h>
 
+// converting celsius to fahrenheit
 main()
 {
 	float fahr, celsius;

The C Programming Language/1.5.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// converting fahrenheit to celsius
+
 main()
 {
 	for (int fahr = 300; fahr >= 0; fahr = fahr - 20)

The C Programming Language/1.8.c

@@ -1,5 +1,7 @@
 #include <stdio.h>
 
+// counting spaces, tabs and newlines
+
 main()
 {
 	int c;

The C Programming Language/1.9.c

@@ -3,6 +3,8 @@
 #define NORMAL 0
 #define SPACEBARING 1
 
+// trimming excessive spacebars down to one
+
 main()
 {
 	int c;