Print the digits in a number in ascending or descending order c program?

Answer 1

#include

/* In case pow does not work from math.h */
int my_pow( int x, int y )
{
int i, result = 1;

for( i=1; i<=y; i++ )
{
result = result * x;
}

return result;
}

int main()
{
int n,i,j, temp1, temp2;

printf("\n Enter number of digits :");
scanf("%d",&n);

for( i= my_pow(10,n-1); i < (my_pow(10,n)-1); i++ )
{
j = n;

do
{
temp1 = ( i / (my_pow(10,(n-j))) ); /* Formula to fetch successive digit */
temp1 = temp1%10;

temp2 = ( i / (my_pow(10, (n-(j-1)))) ); /* Formula to fetch successive digit */
temp2 = temp2%10;

if ( temp1 > temp2 )
{
if ( 1 == j )
{
printf(" %d, ", i );
break;
}

j--;
}
else
{
break;
}

}while(1);
}

printf("\n");

return 1;

}

OUTPUT:

------------

[~/temp-satish]$ ./a.out

Enter number of digits :2
12, 13, 14, 15, 16, 17, 18, 19, 23, 24, 25, 26, 27, 28, 29, 34, 35, 36, 37, 38, 39, 45, 46, 47, 48, 49, 56, 57, 58, 59, 67, 68, 69, 78, 79, 89,
[~/temp-satish]$
[~/temp-satish]$ ./a.out

Enter number of digits :3
123, 124, 125, 126, 127, 128, 129, 134, 135, 136, 137, 138, 139, 145, 146, 147, 148, 149, 156, 157, 158, 159, 167, 168, 169, 178, 179, 189, 234, 235, 236, 237, 238, 239, 245, 246, 247, 248, 249, 256, 257, 258, 259, 267, 268, 269, 278, 279, 289, 345, 346, 347, 348, 349, 356, 357, 358, 359, 367, 368, 369, 378, 379, 389, 456, 457, 458, 459, 467, 468, 469, 478, 479, 489, 567, 568, 569, 578, 579, 589, 678, 679, 689, 789,
[~/temp-satish]$ ./a.out

Enter number of digits :4
1234, 1235, 1236, 1237, 1238, 1239, 1245, 1246, 1247, 1248, 1249, 1256, 1257, 1258, 1259, 1267, 1268, 1269, 1278, 1279, 1289, 1345, 1346, 1347, 1348, 1349, 1356, 1357, 1358, 1359, 1367, 1368, 1369, 1378, 1379, 1389, 1456, 1457, 1458, 1459, 1467, 1468, 1469, 1478, 1479, 1489, 1567, 1568, 1569, 1578, 1579, 1589, 1678, 1679, 1689, 1789, 2345, 2346, 2347, 2348, 2349, 2356, 2357, 2358, 2359, 2367, 2368, 2369, 2378, 2379, 2389, 2456, 2457, 2458, 2459, 2467, 2468, 2469, 2478, 2479, 2489, 2567, 2568, 2569, 2578, 2579, 2589, 2678, 2679, 2689, 2789, 3456, 3457, 3458, 3459, 3467, 3468, 3469, 3478, 3479, 3489, 3567, 3568, 3569, 3578, 3579, 3589, 3678, 3679, 3689, 3789, 4567, 4568, 4569, 4578, 4579, 4589, 4678, 4679, 4689, 4789, 5678, 5679, 5689, 5789, 6789,
[~/temp-satish]$

Answer 2

#include
#include
void main()
{
int n;
clrscr();
printf("Enter a number: ");
scanf("%d",&n);
while(n>=1)
{
printf("%d",n);
printf("\n");
n=n-1;
}
getch();
}