c programming exercise

Pulock2009 · 10-29-2009, 08:28 PM

i need to write the code for this problem:
Q:write a c program to print a pyramid of digits as shown below for n number of lines.
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4
-- -- -- -- -- -- -- --
Actually i have the code as well.But something is wrong. heres the code:

Code:

/*program to print digits in pyramidal form*/
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,k,l,m,n;
clrscr();
printf("\n how many lines?");
scanf("%d",&n);
/*loop 1 to print n lines*/
for(l=1;l<=n;l++)
{
/*loop 2 to print spaces*/
for(i=1;i<=n-l;i++)
printf("       ");
/*loop to print digits in the left side of axis*/
m=l;
for(j=1;j<=l;j++)
{
printf("%6d",m);
m++;
}
/*loop to print digits rightside of axis*/
m=m-2;
for(k=1;k<l;k++)
{
printf("%6d",m);
m--;
}
printf('\n");
}
getch();
}

i ran the code on borlands turbo c++ 3.0 and in the output only the right
side of the axis came. i am unable to figure out the mistake in the code.
thanx in advance.

Pulock2009 · 10-29-2009, 08:33 PM

the pyramid should have been like this:
1
2 3 2
3 4 5 4 3
4 5 6 7 6 5 4

emef · 10-30-2009, 12:32 AM

Code:

#include <stdio.h>

int main(void){
	int i, j, space, repeats;
	repeats = 5;
	for(i = 1; i <= repeats; i++){
		space = repeats-i;
		while(space-- > 0) printf(" ");
		for(j = i; j < 2*i-1; j++)
			printf("%d", j);
		for(j = 2*i-1; j > i-1; j--)
			printf("%d", j);
		putchar('\n');
	}
}

edit:
if you want spaces between the numbers you can change :

space = repeats-i to space = 2*(repeats-i)

and the printf statements to

printf("%d ", j);

also only works at a max of 5 lines.

Spidey · 10-30-2009, 02:48 AM

Quote:

i ran the code on borlands turbo c++ 3.0 and in the output only the right
side of the axis came. i am unable to figure out the mistake in the code.
thanx in advance.

it worked fine for me on visual studio except for this line -

Code:

printf('\n");

which should be

Code:

printf("\n");

10-29-2009, 08:28 PM	#1
Pulock2009 Registered User Join Date: Oct 2009 Posts: 2	c programming exercise i need to write the code for this problem: Q:write a c program to print a pyramid of digits as shown below for n number of lines. 1 2 3 2 3 4 5 4 3 4 5 6 7 6 5 4 -- -- -- -- -- -- -- -- Actually i have the code as well.But something is wrong. heres the code: Code: /program to print digits in pyramidal form/ #include<stdio.h> #include<conio.h> void main() { int i,j,k,l,m,n; clrscr(); printf("\n how many lines?"); scanf("%d",&n); /loop 1 to print n lines/ for(l=1;l<=n;l++) { /loop 2 to print spaces/ for(i=1;i<=n-l;i++) printf(" "); /loop to print digits in the left side of axis/ m=l; for(j=1;j<=l;j++) { printf("%6d",m); m++; } /loop to print digits rightside of axis/ m=m-2; for(k=1;k<l;k++) { printf("%6d",m); m--; } printf('\n"); } getch(); } i ran the code on borlands turbo c++ 3.0 and in the output only the right side of the axis came. i am unable to figure out the mistake in the code. thanx in advance.
Pulock2009 is offline

10-29-2009, 08:33 PM	#2
Pulock2009 Registered User Join Date: Oct 2009 Posts: 2	the pyramid should have been like this: 1 2 3 2 3 4 5 4 3 4 5 6 7 6 5 4
Pulock2009 is offline

10-30-2009, 12:32 AM	#3
emef Registered User Join Date: Oct 2009 Posts: 8	Code: #include <stdio.h> int main(void){ int i, j, space, repeats; repeats = 5; for(i = 1; i <= repeats; i++){ space = repeats-i; while(space-- > 0) printf(" "); for(j = i; j < 2i-1; j++) printf("%d", j); for(j = 2i-1; j > i-1; j--) printf("%d", j); putchar('\n'); } } edit: if you want spaces between the numbers you can change : space = repeats-i to space = 2(repeats-i) and the printf statements to printf("%d ", j); also only works at a max of 5 lines. Last edited by emef; 10-30-2009 at 12:42 AM.*
emef is offline

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