diff options
Diffstat (limited to 'org')
| -rw-r--r-- | org/c/ex_01.org | 7 | ||||
| -rw-r--r-- | org/c/ex_03.org | 47 | ||||
| -rw-r--r-- | org/c/ex_04.org | 15 | ||||
| -rw-r--r-- | org/c/ex_05.org | 80 |
4 files changed, 146 insertions, 3 deletions
diff --git a/org/c/ex_01.org b/org/c/ex_01.org index d479a84..fd6f685 100644 --- a/org/c/ex_01.org +++ b/org/c/ex_01.org @@ -1,9 +1,12 @@ * Exercise 1. +This isn't my first rodeo, so I won't be breaking everything down. + +My aim doing this using org-mode in a literate style is to produce some sort of useful documentation for myself, something like a cookbook. #+BEGIN_SRC C #include <stdio.h> - + /* comments for fun and proffit */ int main(int argc, char *argv[]) { int distance = 100; @@ -16,5 +19,3 @@ #+RESULTS: : you are 100 miles away. - -Big notable bits from this are the ~#include~. diff --git a/org/c/ex_03.org b/org/c/ex_03.org new file mode 100644 index 0000000..b889a2c --- /dev/null +++ b/org/c/ex_03.org @@ -0,0 +1,47 @@ +* Exercise 3 + +#+BEGIN_SRC C + #include <stdio.h> + + int main() + { + int age = 10; + int height = 72; + + printf("I am %d years old.\n", age); + printf("I am %d inches tall.\n", height); + + return 0; + } +#+END_SRC + +#+RESULTS: +| I | am | 10 | years | old. | +| I | am | 72 | inches | tall. | + +** printf conversion specifiers + ++ %%, Print a single % character ++ %c, Convert an int to an unsigned character and print the resulting character ++ %d or %i, Print an int as a signed decimal number ++ %u, Print an unsigned as an unsigned decimal number ++ %o, Print an unsigned as an unsigned octal number ++ %x, Hexadecimal notation (using lowercase letters a-f) ++ %X, Hexadecimal notation (using uppercase letters A-F) ++ %e, Exponential notation (using a lowercase e as in 3.1415e+00) ++ %E, Exponential notation (using an uppercase E as in 3.1415E+00) ++ %f, Print a double using a decimal format like [-]ddd.ddd ++ %g, The more compact of %e or %f, insignificant zeros do not print. ++ %G, Same as g, but using an uppercase E ++ %s, Print the string pointed to by a char * ++ %p, Print a void * argument in hexadecimal (ANSI C only) ++ %n, Store the number of characters printed at this point in the integer pointed to by the int * argument. Nothing is printed. (ANSI C only). + +** printf escape sequences + ++ \n, prints a new line ++ \b, backs up one character ++ \t, moves the output position to the next tab stop ++ \\, prints a backslash ++ \", prints a double quote ++ \', prints a single quote diff --git a/org/c/ex_04.org b/org/c/ex_04.org new file mode 100644 index 0000000..d287dca --- /dev/null +++ b/org/c/ex_04.org @@ -0,0 +1,15 @@ +* Exercise 4 + +Debuggers, baby! + +#+BEGING_SRC plaintext +gdb --args // this flag allows you to pass arguments *through* gdb + // into a program, without this flag gdb assumes any + // passed arguments are for it + +gdb --batch --ex r --ex bt --ex q --args +// run the program so that if it fails you get a backtrace +#+END_SRC + +Sometimes you have lldb instead of gdb. They are similar, but slightly different -- brace yourself for this. + diff --git a/org/c/ex_05.org b/org/c/ex_05.org new file mode 100644 index 0000000..799712f --- /dev/null +++ b/org/c/ex_05.org @@ -0,0 +1,80 @@ +* Exercise 5 +** Operators +*** arithmetic operators +| operator | description | +|----------+-------------| +| + | add | +| - | subtract | +| * | multiply | +| / | divide | +| % | modulus | +| ++ | increment | +| -- | decrement | + +*** relational operators +| operator | description | +|----------+--------------------| +| == | equal | +| != | not equal | +| > | greater than | +| < | less than | +| >= | greater than equal | +| <= | less than equal | + +*** logical operators +Logical operators perform logic tests. They weirdest one is the [[https:www.freecodecamp.org/news/c-ternary-operator/][ternary operator]]. + +The ternary operator is sort of like a different way to write an if/else statement. + +#+BEGIN_SRC plaintext +condition ? value_if_true : value_if_false +#+END_SRC + +| operator | description | +|----------+-----------------| +| && | logical and | +| || | logical or | +| ! | logical not | +| ? : | logical ternary | + +*** bitwise operators +Bitwise operators are the weirdos, and the ones you don't often encounter in other languages...or like, in JavaScript, I guess. They alter bits directly. They are useful when working in low-level systems. + +| operator | description | +|----------+--------------------------| +| & | bitwise and | +| | | bitwise or | +| ^ | bitwise xor | +| ~ | bitwise one's complement | +| << | bitwise shift left | +| >> | bitwise shift right | + +*** assignment operators +Assignment operators assign expressions to variables. + +| operator | description | +|----------+--------------------------| +| = | assign equal | +| += | assign plus-equal | +| -= | assign minus-equal | +| *= | assign multiply-equal | +| /= | assign divide-equal | +| %= | assign modulus-equal | +| <<= | assign shift-left-equal | +| >>= | assign shift-right-equal | +| &= | assign and-equal | +| ^= | assign xor-equal | +| | | assign or-equal | + +*** data operators +These deal with aspects of pointers, member access and various other data structures in C. + +| operator | description | +|----------+-----------------------| +| sizeof() | get the size of | +| [] | array subscript | +| & | the address of | +| * | the value of | +| -> | structure dereference | +| . | structure reference | + |