Printing Output

Remember the Variables Example where we assigned a bunch of random variables. Let's print those variables to the Screen

Variables Example Continued

#include <stdio.h>

main() {

    // declare variables

    int i_am_an_integer;

    char i_am_a_char;

    float i_am_a_float;

    double i_am_a_double;

    // initialize variables

    i_am_an_integer = 11;

    i_am_a_char = 'c';

    i_am_a_float = 1.23;

    i_am_a_double = 1.23;

    // use variables

    printf("This is an integer: %i \n", i_am_an_integer);

    printf("This is an char: %c \n", i_am_a_char);

    printf("This is an float: %2.3f \n", i_am_a_float);

    printf("This is an double: %f \n", i_am_a_double);

printf needs the conversion specifier to know what type the variable is
the conversion specifiers are listed Here and http://en.cppreference.com/w/c/io/fprintf
the conversion specifiers can be formatted with optional flags listed at http://en.wikipedia.org/wiki/Printf_format_string#Format_placeholder_specification (Section Format Placeholders)
printf is not very smart and will do exactly as you tell it, so if you are not careful errors can propagate throughout your program
char's has a int representation, http://www.asciitable.com

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