fattumsdad
asked on
Sorting Random Numbers (and making non 0 based)
Hello all,
Quick question here... I have a program that generates 5 random numbers and then displays them on the screen. How do I sort the 5 numbers from smallest to largest before they display? Also, how should I alter this code to make the random numbers between 1 and 47 vice 0 and 47? And finally, how do I put a 5 second (or so) delay between each number to avoid any possible duplicates? The code I have is below:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main ()
{
srand ( time(NULL) );
int n1 = rand()%47;
int n2 = rand()%47;
int n3 = rand()%47;
int n4 = rand()%47;
int n5 = rand()%47;
printf ("%d ", n1);
printf ("%d ", n2);
printf ("%d ", n3);
printf ("%d ", n4);
printf ("%d ", n5);
system("pause");
return 0;
}
As usual, any and all help is greatly appreciated. Thanks in advance!!
Regards,
Tony
Quick question here... I have a program that generates 5 random numbers and then displays them on the screen. How do I sort the 5 numbers from smallest to largest before they display? Also, how should I alter this code to make the random numbers between 1 and 47 vice 0 and 47? And finally, how do I put a 5 second (or so) delay between each number to avoid any possible duplicates? The code I have is below:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int main ()
{
srand ( time(NULL) );
int n1 = rand()%47;
int n2 = rand()%47;
int n3 = rand()%47;
int n4 = rand()%47;
int n5 = rand()%47;
printf ("%d ", n1);
printf ("%d ", n2);
printf ("%d ", n3);
printf ("%d ", n4);
printf ("%d ", n5);
system("pause");
return 0;
}
As usual, any and all help is greatly appreciated. Thanks in advance!!
Regards,
Tony
You will find it much easier to visualize what you need to do if you
store the random numbers in an array:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NUMS 5
int main ()
{
srandom ( time(NULL) );
int i;
int numarray[NUMS];
for (i = 0; i < NUMS; i++)
numarray[i] = random()%47; // mod 47???
printf("Original Order: );
for (i = 0; i < NUMS; i++)
printf("%d ", numarray[i])
printf("\n");
/* sort the array elements here */
printf("Sorted Order: );
for (i = 0; i < NUMS; i++)
printf("%d ", numarray[i])
printf("\n");
system("pause");
return 0;
}
store the random numbers in an array:
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define NUMS 5
int main ()
{
srandom ( time(NULL) );
int i;
int numarray[NUMS];
for (i = 0; i < NUMS; i++)
numarray[i] = random()%47; // mod 47???
printf("Original Order: );
for (i = 0; i < NUMS; i++)
printf("%d ", numarray[i])
printf("\n");
/* sort the array elements here */
printf("Sorted Order: );
for (i = 0; i < NUMS; i++)
printf("%d ", numarray[i])
printf("\n");
system("pause");
return 0;
}
ASKER
What compiler are you folks using? I cut & pasted each code into a new project, and get multiple errors in each? I am using Dev-C++ (Bloodshed). I have Visual C++ 6.0 as well. If I paste this into a new project, should it be a Win32 Console Project? Console that supports MFC?
I'm *very* new to C++ so if anyone has a better idea of how to make this number generator, I'll all for it :)
Thanks,
Tony
I'm *very* new to C++ so if anyone has a better idea of how to make this number generator, I'll all for it :)
Thanks,
Tony
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ASKER
jkr,
Thank you!! I appreciate the help!!
Regards,
Tony
Thank you!! I appreciate the help!!
Regards,
Tony
Actually, we can do better :o)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_NUMS
int __cdecl compare( const void * elem1, const void * elem2 ) {
int n1 = *(int*) elem1;
int n2 = *(int*) elem2;
if (n1 > n2) return 1;
if (n1 < n2) return -1;
return 0;
}
int main ()
{
srand ( time(NULL) );
int n[MAX_NUMS];
for ( int i = 0; i < MAX_NUMS; ++i) n[i] = rand()%47;
for ( int i = 0; i < MAX_NUMS; ++i) printf ("%d ", n[i]);
printf ( "\n");
qsort ( (void*) n, MAX_NUMS, sizeof(int), compare);
for ( i = 0; i < MAX_NUMS; ++i) printf ("%d ", n[i]);
printf ( "\n");
system("pause");
return 0;
}
BTW, I shamelessly used brettmjohnson's good point of #defining the number of numbers as a perprocessor symbol :o)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define MAX_NUMS
int __cdecl compare( const void * elem1, const void * elem2 ) {
int n1 = *(int*) elem1;
int n2 = *(int*) elem2;
if (n1 > n2) return 1;
if (n1 < n2) return -1;
return 0;
}
int main ()
{
srand ( time(NULL) );
int n[MAX_NUMS];
for ( int i = 0; i < MAX_NUMS; ++i) n[i] = rand()%47;
for ( int i = 0; i < MAX_NUMS; ++i) printf ("%d ", n[i]);
printf ( "\n");
qsort ( (void*) n, MAX_NUMS, sizeof(int), compare);
for ( i = 0; i < MAX_NUMS; ++i) printf ("%d ", n[i]);
printf ( "\n");
system("pause");
return 0;
}
BTW, I shamelessly used brettmjohnson's good point of #defining the number of numbers as a perprocessor symbol :o)
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int compare( (void *) elem1, (void *) elem2 ) {
int n1 = (int) elem1;
int n2 = (int) elem2;
if (n1 > n2) return 1;
if (n1 < n2) return -1;
return 0;
}
int main ()
{
srand ( time(NULL) );
int n[5];
n[0] = rand()%47;
n[1] = rand()%47;
n[2] = rand()%47;
n[3] = rand()%47;
n[4] = rand()%47;
for ( int i = 0; i < 5; ++i) printf ("%d ", n[i]);
qsort ( (void*) n, 5, sizeof(int), compare);
for ( int i = 0; i < 5; ++i) printf ("%d ", n[i]);
system("pause");
return 0;
}