How to make a diamond in C with nested for loops

[climatewarrior]

Hi this is a solution to a common programming exercise where you have to make a program that makes diamonds using nested for loops. This is only one way you can do it. There are many ither ways to do it




#include <stdio.h>
int main()
{
int i,j,k;

printf("Select Size \n");
scanf("%d",&k);


for(i=1; i<=k; i++)

{

for(j=1; j<=k-i; j++)

{
printf(" ");
}

for(j=1; j<=2*i-1; j++)

{
printf("*");
}

printf("\n");

}

for(i=1; i<k; i++)

{

for(j=1; j<=i; j++)

{
printf(" ");
}

for(j=2*k-2*i-1; j>=1; j--)

{
printf("*");
}

printf("\n");

}

return(0);

}

[Smygis]

And?

Btw, Always use [ code ] taggs when posting code.

[Jessehk]

That's nice.

[Arwen]

Cute :-)

[CptPicard]

It's also a typical homework assignment, so it would probably be better form not to spread code around, especially considering that I'm afraid you will not be getting any mad props for this yet.. ;)

[slavik]

I had to do something similar ... but in assembly :(

[red_hax0r]

Here's a more elegant, but equally long example. It fixes a few problems such as making the number of vertical and horizontal asterisks equal to the actual size given. Also note that an even size yields an even number of stars on every line.



#include <stdio.h>
#include <stdlib.h>

#define SIZE_LEN 3

int get_size()
{
char input_str[SIZE_LEN];

printf("What size diamond? ");
fgets(input_str, SIZE_LEN, stdin);
printf("\n");
return atoi(input_str);
}

void print_chars(int n_times, char c)
{
int i;
for (i=0; i<n_times; i++)
{
printf("%c", c);
}
}

int main()
{
int i;
int odd=0, even=0;
int size;

int n_stars=1;
int reverse=0;

size = get_size();

if (size%2!=0)
odd=1;
else
even=1;

for (i=0; i<size; i++)
{
print_chars(size/2-n_stars+odd, ' ');
print_chars(n_stars*2-odd, '*');
print_chars(1, '\n');
if (!reverse)
n_stars+=1;
else
n_stars-=1;
if (n_stars>size/2-even)
reverse=1;
else if (n_stars<=0)
break;
}
return 0;
}

[overdrank]

http://img147.imageshack.us/img147/5451/necromancing.jpg
From the Ubuntu Forums Code of Conduct (http://ubuntuforums.org/index.php?page=policy).

If a post is older than a year or so and hasn't had a new reply in that time, instead of replying to it, create a new thread. In the software world, a lot can change in a very short time, and doing things this way makes it more likely that you will find the best information. You may link to the original discussion in the new thread if you think it may be helpful.
Thread closed.