Fix c tutorial

Fixes #678

Still missing symbols, though

c.html.markdown

@@ -34,11 +34,11 @@ enum days {SUN = 1, MON, TUE, WED, THU, FRI, SAT};
 
 // (File names between <angle brackets> are headers from the C standard library.)
 // For your own headers, use double quotes instead of angle brackets:
-#include "my_header.h"
+//#include "my_header.h"
 
 // Declare function signatures in advance in a .h file, or at the top of
 // your .c file.
-void function_1(char c);
+void function_1();
 int function_2(void);
 
 // Must declare a 'function prototype' before main() when functions occur after
@@ -84,8 +84,8 @@ int main() {
   unsigned long long ux_long_long;
 
   // chars inside single quotes are integers in machine's character set. 
-    '0' // => 48 in the ASCII character set. 
-    'A' // => 65 in the ASCII character set. 
+  '0'; // => 48 in the ASCII character set. 
+  'A'; // => 65 in the ASCII character set. 
 
   // sizeof(T) gives you the size of a variable with type T in bytes
   // sizeof(obj) yields the size of the expression (variable, literal, etc.).
@@ -127,8 +127,8 @@ int main() {
   fgets(buf, sizeof buf, stdin);
 
   // strtoul parses a string to an unsigned integer
-    size_t size = strtoul(buf, NULL, 10);
-    int var_length_array[size]; // declare the VLA
+  size_t size2 = strtoul(buf, NULL, 10);
+  int var_length_array[size2]; // declare the VLA
   printf("sizeof array = %zu\n", sizeof var_length_array);
 
   // A possible outcome of this program may be:
@@ -166,8 +166,8 @@ int main() {
   int i1 = 1, i2 = 2; 
   float f1 = 1.0, f2 = 2.0;
 
-    int a, b, c;
-    a = b = c = 0;
+  int b, c;
+  b = c = 0;
 
   // Arithmetic is straightforward
   i1 + i2; // => 3
@@ -194,9 +194,8 @@ int main() {
   2 >= 2; // => 1
 
   // C is not Python - comparisons don't chain.
-    int a = 1;
   // WRONG:
-    int between_0_and_2 = 0 < a < 2;
+  //int between_0_and_2 = 0 < a < 2;
   // Correct:
   int between_0_and_2 = 0 < a && a < 2;
 
@@ -209,8 +208,8 @@ int main() {
   0 || 0; // => 0
 
   //Conditional expression ( ? : )
-    int a = 5;
-    int b = 10;
+  int e = 5;
+  int f = 10;
   int z;
   z = (a > b) ? a : b; // => 10 "if a > b return a, else return b." 
 
@@ -280,7 +279,7 @@ int main() {
   }
 
   // branching with multiple choices: switch()
-    switch (some_integral_expression) {
+  switch (a) {
   case 0: // labels need to be integral *constant* expressions
     do_stuff();
     break; // if you don't break, control flow falls over labels
@@ -372,11 +371,11 @@ int main() {
   int (*ptr_to_arr)[10] = &arr; // &arr is NOT of type `int *`!
   // It's of type "pointer to array" (of ten `int`s).
   // or when the array is a string literal used for initializing a char array:
-    char arr[] = "foobarbazquirk";
+  char otherarr[] = "foobarbazquirk";
   // or when it's the argument of the `sizeof` or `alignof` operator:
-    int arr[10];
-    int *ptr = arr; // equivalent with int *ptr = &arr[0];
-    printf("%zu, %zu\n", sizeof arr, sizeof ptr); // probably prints "40, 4" or "40, 8"
+  int arraythethird[10];
+  int *ptr = arraythethird; // equivalent with int *ptr = &arr[0];
+  printf("%zu, %zu\n", sizeof arraythethird, sizeof ptr); // probably prints "40, 4" or "40, 8"
 
 
   // Pointers are incremented and decremented based on their type
@@ -432,7 +431,7 @@ int add_two_ints(int x1, int x2)
 
 /*
 Functions are call by value. When a function is called, the arguments passed to 
-the function are copies of the original arguments (except arrays). Anything you  
+≈the function are copies of the original arguments (except arrays). Anything you  
 do to the arguments in the function do not change the value of the original 
 argument where the function was called. 
 
@@ -467,9 +466,9 @@ void testFunc() {
 }
 
 //make external variables private to source file with static:
-static int i = 0; //other files using testFunc() cannot access variable i
-void testFunc() {
-    extern int i;
+static int j = 0; //other files using testFunc() cannot access variable i
+void testFunc2() {
+  extern int j;
 }
 //**You may also declare functions as static to make them private**
 
@@ -523,7 +522,7 @@ int area(rect r)
 
 // if you have large structs, you can pass them "by pointer" to avoid copying
 // the whole struct:
-int area(const rect *r)
+int areaptr(const rect *r)
 {
   return r->width * r->height;
 }
@@ -560,36 +559,37 @@ typedef void (*my_fnp_type)(char *);
 // my_fnp_type f; 
 
 //Special characters:
-'\a' // alert (bell) character
-'\n' // newline character
-'\t' // tab character (left justifies text)
-'\v' // vertical tab
-'\f' // new page (form feed)
-'\r' // carriage return
-'\b' // backspace character
-'\0' // NULL character. Usually put at end of strings in C. 
+/*
+'\a'; // alert (bell) character
+'\n'; // newline character
+'\t'; // tab character (left justifies text)
+'\v'; // vertical tab
+'\f'; // new page (form feed)
+'\r'; // carriage return
+'\b'; // backspace character
+'\0'; // NULL character. Usually put at end of strings in C. 
 //   hello\n\0. \0 used by convention to mark end of string. 
-'\\' // backslash
-'\?' // question mark
-'\'' // single quote
-'\"' // double quote
-'\xhh' // hexadecimal number. Example: '\xb' = vertical tab character
-'\ooo' // octal number. Example: '\013' = vertical tab character
+'\\'; // backslash
+'\?'; // question mark
+'\''; // single quote
+'\"'; // double quote
+'\xhh'; // hexadecimal number. Example: '\xb' = vertical tab character
+'\ooo'; // octal number. Example: '\013' = vertical tab character
 
 //print formatting:
-"%d"    // integer
-"%3d"   // integer with minimum of length 3 digits (right justifies text)
-"%s"    // string
-"%f"    // float
-"%ld"   // long
-"%3.2f" // minimum 3 digits left and 2 digits right decimal float 
-"%7.4s" // (can do with strings too)
-"%c"    // char
-"%p"    // pointer
-"%x"    // hexadecimal
-"%o"    // octal
-"%%"    // prints % 
-
+"%d";    // integer
+"%3d";   // integer with minimum of length 3 digits (right justifies text)
+"%s";    // string
+"%f";    // float
+"%ld";   // long
+"%3.2f"; // minimum 3 digits left and 2 digits right decimal float 
+"%7.4s"; // (can do with strings too)
+"%c";    // char
+"%p";    // pointer
+"%x";    // hexadecimal
+"%o";    // octal
+"%%";    // prints % 
+*/
 ///////////////////////////////////////
 // Order of Evaluation
 ///////////////////////////////////////