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Merge pull request #1217 from joesavage/master

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[c/en] add missing semicolons, fix spacing, change main() to main(void), modify additional resources section
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Geoff Liu
2015-08-30 14:44:08 -06:00
parent b124fd58df e0d0e9189b
commit 6957b6174d
1 changed files with 15 additions and 15 deletions
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@@ -18,9 +18,9 @@ memory management and C will take you as far as you need to go.
```c
// Single-line comments start with // - only available in C99 and later.
/*
/*
Multi-line comments look like this. They work in C89 as well.
*/
*/
/*
Multi-line comments don't nest /* Be careful */ // comment ends on this line...
@@ -55,7 +55,7 @@ int add_two_ints(int x1, int x2); // function prototype
// Your program's entry point is a function called
// main with an integer return type.
int main() {
int main(void) {
// print output using printf, for "print formatted"
// %d is an integer, \n is a newline
printf("%d\n", 0); // => Prints 0
@@ -157,12 +157,12 @@ int main() {
int cha = 'a'; // fine
char chb = 'a'; // fine too (implicit conversion from int to char)
//Multi-dimensional arrays:
// Multi-dimensional arrays:
int multi_array[2][5] = {
{1, 2, 3, 4, 5},
{6, 7, 8, 9, 0}
};
//access elements:
// access elements:
int array_int = multi_array[0][2]; // => 3
///////////////////////////////////////
@@ -183,8 +183,8 @@ int main() {
i1 / i2; // => 0 (0.5, but truncated towards 0)
// You need to cast at least one integer to float to get a floating-point result
(float)i1 / i2 // => 0.5f
i1 / (double)i2 // => 0.5 // Same with double
(float)i1 / i2; // => 0.5f
i1 / (double)i2; // => 0.5 // Same with double
f1 / f2; // => 0.5, plus or minus epsilon
// Floating-point numbers and calculations are not exact
@@ -219,13 +219,13 @@ int main() {
0 || 1; // => 1 (Logical or)
0 || 0; // => 0
//Conditional expression ( ? : )
// Conditional expression ( ? : )
int e = 5;
int f = 10;
int z;
z = (e > f) ? e : f; // => 10 "if e > f return e, else return f."
//Increment and decrement operators:
// Increment and decrement operators:
char *s = "iLoveC";
int j = 0;
s[j++]; // => "i". Returns the j-th item of s THEN increments value of j.
@@ -471,13 +471,13 @@ str_reverse(c);
printf("%s\n", c); // => ".tset a si sihT"
*/
//if referring to external variables outside function, must use extern keyword.
// if referring to external variables outside function, must use extern keyword.
int i = 0;
void testFunc() {
extern int i; //i here is now using external variable i
}
//make external variables private to source file with static:
// make external variables private to source file with static:
static int j = 0; //other files using testFunc2() cannot access variable j
void testFunc2() {
extern int j;
@@ -634,7 +634,7 @@ Best to find yourself a copy of [K&R, aka "The C Programming Language"](https://
It is *the* book about C, written by Dennis Ritchie, the creator of C, and Brian Kernighan. Be careful, though - it's ancient and it contains some
inaccuracies (well, ideas that are not considered good anymore) or now-changed practices.
Another good resource is [Learn C the hard way](http://c.learncodethehardway.org/book/).
Another good resource is [Learn C The Hard Way](http://c.learncodethehardway.org/book/).
If you have a question, read the [compl.lang.c Frequently Asked Questions](http://c-faq.com).