Goal: Sort a Struct of 3 Dice and Return Sorted
#include <stdio.h>
#include <string.h>
#include <time.h>
Struct
struct RolledDice
{
int die1 ;
int die2 ;
int die3 ;
} dice;
Prototype
void sort_dice(struct RolledDice dice );
Main
int main() {
srand ( time(NULL) );
dice.die1 = rand() % 6 + 1 ;
dice.die2 = rand() % 6 + 1 ;
dice.die3 = rand() % 6 + 1 ;
sort_dice(dice);
return 0;
}
Sort Dice Function
void sort_dice(struct RolledDice dice) {
printf("Die 1: %d \n", dice.die1);
printf("Die 2: %d \n", dice.die2);
printf("Die 3: %d \n\n", dice.die3);
int tempDie = 0;
(There may be a better way to do this......but this is the best I could come up with)
while ( dice.die1 < dice.die2 || dice.die1 < dice.die3 || dice.die2 < dice.die3 )
{
if ( dice.die1 < dice.die2 )
{
tempDie = dice.die1 ;
dice.die1 = dice.die2 ;
dice.die2 = tempDie ;
}
if ( dice.die1 < dice.die3 )
{
tempDie = dice.die1 ;
dice.die1 = dice.die3 ;
dice.die3 = tempDie ;
}
if (dice.die2 < dice.die3 )
{
tempDie = dice.die2 ;
dice.die2 = dice.die3 ;
dice.die3 = tempDie ;
}
}
printf( "Die 1: %d \n", dice.die1 );
printf( "Die 2: %d \n", dice.die2 );
printf( "Die 3: %d \n\n", dice.die3 );
}
I tried changing the void
to int
and struct
but kept getting errors, or it wouldn't update the struct
in the main
.
You're sorting a copy of your dice
structure, which is lost as soon as it goes out of scope when the function returns.
change your function to:
struct RolledDice sort_dice(struct RolledDice dice) {
and in the end just return dice
usage:
int main() {
srand ( time(NULL) );
dice.die1 = rand() % 6 + 1 ;
dice.die2 = rand() % 6 + 1 ;
dice.die3 = rand() % 6 + 1 ;
dice = sort_dice(dice);
// print the sorted struct here
printf( "Die 1: %d \n", dice.die1 );
printf( "Die 2: %d \n", dice.die2 );
printf( "Die 3: %d \n\n", dice.die3 );
return 0;
}
Or pass dice
as a pointer and use dice->
instead of dice.
in your function (heavier refactoring but less memory copy and thus more performant)
void sort_dice(struct RolledDice *dice) {
...
dice->die1 = dice->die3 ;
...
usage:
int main() {
srand ( time(NULL) );
dice.die1 = rand() % 6 + 1 ;
dice.die2 = rand() % 6 + 1 ;
dice.die3 = rand() % 6 + 1 ;
sort_dice(&dice); // pass as pointer so it can be modified in the function
// print the sorted struct here
printf( "Die 1: %d \n", dice.die1 );
printf( "Die 2: %d \n", dice.die2 );
printf( "Die 3: %d \n\n", dice.die3 );
return 0;
}
note: your original code prints the bubble-sorted values correctly within your sort routine. I suppose that the problem is that you did not find a way to update it in the caller function (creating a function to just print sorted values is useless)
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