1 121 12321 C Coding

The trick to solve it is, you have to imagine the pyramid to be composed of 3 seperate triangles.see image(sorry for bad pic)

Imagine pyramid to be made up of 3 triangles

It is upon you how many levels you want in your pyramid,for eg the pyramid in pic is 3 layerd.ie 1 121 12321

so for each layer you have to use 3 triangles which make up the pyramid,So you have to use following 4 loops

to implement the 4 ideas

1.Total number of  Rows

You use loop to tell how many layers you want.ie say no of layer is n (eq int n=3)

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

{

2.First triangle is blank space

you have to use a loop to populate the blank space:

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

printf(” “);

3.Second triangle is made up of sequence which increases in value

You have to use another loop to create the sequence  which increases

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

 printf(“%d”,k);

4.Third triangle is made up of sequence which decreases in value

So you have to use yet another loop to decrease the value:

for(l=(i-1);l>=1;l–)

 printf(“%d”,l);

}

Here is the code you can try

#include<stdio.h>
void main()
{
int i,j,n,k,l;
for(i=1;i<=n;i++)
{
for(j=1;j<=(n-i);j++)
printf(" ");
for(k=1;k<=i;k++)

printf("%d",k);    
for(l=(i-1);l>=1;l--)
printf("%d",l);

printf("n");
}
}