C Projects

Managed entirely (for the first time) by git!

Following the great book by the Masters:

Topics covered:

• Printing to stdout
• Basic arithmatic operations
• Variables
• While loop
• For loop
• Symbolic Constants
• Character I/O
• Array

Notes

while (i< j)
    i = 2 * i
/* Can be without braces if it is a single statement */ 
/* needs to be indented */

printf("%3d", 1);
/*       ^ 3 blank spaces and 1 is to the very right*/
printf("%6d", 1);
/*       ^ 3 blank spaces + 3 padding blank spaces = 6 blank spaces*/
printf("%6.3", 1);
/*       ^^^ 3 blank spaces + 3 padding spaces + .3 means 1 -> 001*/
printf("%*.*d", 3,2,1);

"C" ≠ 'C'
"C" returns a string
'C' returns the ASCII character code of C

// Macros

#define dprint(expr) printf(#expr " %g\n", expr)

dprint(3/2);

// when dprint is called

printf("3/2" " (evaluated expr)", expr);
printf("3/2 (evaluated expr)", expr);

Similarly, token pasting is done with dprint(A, B) A ## B will create a TOKEN this is NOT a string, this is a TOKEN

#include <stdio.h>

// Macro definition using the Token-pasting operator
#define concat(a, b) a##b
int main(void) {
    int xy = 30;

    // Printing the concatenated value of x and y
    printf("%d", concat(x, y));
    return 0;
}