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#include <stdio.h>
int main(int argc, char *argv[])
int bugs = 100;
double bug_rate = 1.2;
printf("You have %d bugs at the imaginary rate of %f.\n",
bugs, bug_rate);
long universe_of_defects = 1L * 1024L * 1024L * 1024L;
printf("The entire universe has %ld bugs.\n",
double expected_bugs = bugs * bug_rate;
printf("You are expected to have %f bugs.\n",
double part_of_universe = expected_bugs / universe_of_defects;
printf("That is only a %e portion of the universe.\n",
// this makes no sense, just a demo of something weird
char nul_byte = '\0';
int care_percentage = bugs * nul_byte;
printf("Which means you should care %d%%.\n",
// printf("Printing null byte with %%s: %s \n", nul_byte);
// printf("Printing null byte with %%c: %c \n", nul_byte);
// 1) various sizes of universe_of_defects
// ANSWER: "warning: integer constant is too large for its type"
// 2) what do these huge numbers actually print out?
// ANSWER: the huge number prints as 0. part_of_universe_prints as "inf"
// 3) Change long to unsigned long and find the number that's too big
// ANSWER: the expression
// unsigned long universe_of_defects = 100000000000L * 1024L * 1024L * 1024L;
// has compiler error "warning: integer overflow in expression" and causes
// later expressions to overflow
// 4) Understand what unsigned does
// ANSWER: Expands the maximum value that can be stored in a variable
// by removing the negative range. See below:
long foo = -10000L;
unsigned long bar = -10000L;
printf(">> Extra credit 4:\n");
printf("\tfoo = %ld\n", foo);
printf("\tbar = %lu\n", bar); //
// 5) explain to yourself why you can multiply char and int.
// char is merely the numeric code for a character that can be displayed
// on screen or printed to hard copy. As such, it is subject to
// arithmetic. Another way of thinking about it is that a char value is a
// pointer to an entry in a character table, and - like pointers - is subject
// to arithmetic.
return 0;
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