Remove bad examples, reword places.

This commit is contained in:
Levi Bostian 2013-11-25 09:21:40 -06:00
parent 67a5236629
commit df3cc00f52

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@ -20,7 +20,7 @@ memory management and C will take you as far as you need to go.
Multi-line comments look like this. They work in C89 as well.
*/
// Constants: #define <keyword> (no semicolon at end)
// Constants: #define <keyword>
#define DAYS_IN_YEAR 365
//enumeration constants are also ways to declare constants.
@ -38,7 +38,7 @@ enum days {SUN = 1, MON, TUE, WED, THU, FRI, SAT};
// Declare function signatures in advance in a .h file, or at the top of
// your .c file.
void function_1(char s[]);
void function_1(char c);
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 on the ASCII character set.
'A' //==> 65 on 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.).
@ -154,16 +154,16 @@ int main() {
{6, 7, 8, 9, 0}
}
//access elements:
int array_int = multi_array[0][2]; //=> 3
int array_int = multi_array[0][2]; // => 3
///////////////////////////////////////
// Operators
///////////////////////////////////////
int i1 = 1, i2 = 2; // Shorthand for multiple declaration
// Shorthands for multiple declarations:
int i1 = 1, i2 = 2;
float f1 = 1.0, f2 = 2.0;
//more shorthands:
int a, b, c;
a = b = c = 0;
@ -215,9 +215,9 @@ int main() {
//Increment and decrement operators:
char *s = "iLoveC"
int j = 0;
s[j++]; // => "i" Returns value of j to s THEN increments value of j.
s[j++]; // => "i". Returns the j-th item of s THEN increments value of j.
j = 0;
s[++j]; // => "L" Increments value of j THEN returns value of j to s.
s[++j]; // => "L". Increments value of j THEN returns j-th value of s.
// same with j-- and --j
// Bitwise operators!
@ -271,7 +271,7 @@ int main() {
printf("\n");
// *****NOTES*****:
// Loops MUST always have a body. If no body is needed, do:
// Loops and Functions MUST have a body. If no body is needed:
int i;
for (i = 0; i <= 5; i++) {
; // use semicolon to act as the body (null statement)
@ -429,12 +429,12 @@ int add_two_ints(int x1, int x2)
}
/*
Functions are call by value. So when a function is called, the arguments passed
to the function are copies of original arguments (except arrays). Anything you
do to your arguments do not change the value of the actual argument where the
function was called.
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
do to the arguments in the function do not change the value of the original
argument where the function was called.
You can use pointers if you need to edit the original argument values.
Use pointers if you need to edit the original argument values.
Example: in-place string reversal
*/
@ -452,19 +452,6 @@ void str_reverse(char *str_in)
}
}
/////////////////////////////////////
// Built in functions:
/////////////////////////////////////
// from: #include <stdio.h>
// ** getchar() **
// int c = getchar(); //reads character from input.
// If input = hi, 'h' is returned then next call, 'i' returned.
while ((c = getchar()) != EOF) { // EOF constant "end of file".
// Linux: CTRL+D, Windows: CTRL+X
// must have () around getchar() as != is run before =.
putchar(c); //prints character (without newline at end)
}
//if referring to external variables outside function, must use extern keyword.
int i = 0;
void testFunc() {