Pyramids in C++

[siddharth_1202]

Hi Friends,
I am a beginner in C++ I have to make a programms using loops to get the out put as
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15

also I have to write a program having output as
1
121
12321
1234321
123454321
The pyramid mentioned above should look like a pyramid and not like a right triangle.

please help me as I am not very well aware about the concepts of loops.

[laserlight]

What have you tried?

You could use [code][/code] tags to help format your expected output.

[cilu]

I have an example here: http://mariusbancila.ro/blog/?p=143.

[potatoCode]

I have an example here: http://mariusbancila.ro/blog/?p=143.

Hello cilu!
How are you?
Haha that looks so cool!

[siddharth_1202]

I have an example here: http://mariusbancila.ro/blog/?p=143.

Thanks for your reply, it helped me, but I am still not able to get
1
23
456
78910

can you please give me some more tips.
I also made another program for printing
....1
...121
..12321
. 1234321
1 2 3 4 5 4 3 2 1

[Paul McKenzie]

Thanks for your reply, it helped me, but I am still not able to get
1
23
456
78910

can you please give me some more tips.

You've shown no code, so what "tips" can we give you? Maybe "work harder".

I also made another program for printing
....1
...121
..12321
. 1234321
1 2 3 4 5 4 3 2 1

So far, you've shown no code that you came up with. You need to show us what you've done.

Regards,

Paul McKenzie

[siddharth_1202]

You've shown no code, so what "tips" can we give you? Maybe "work harder".
So far, you've shown no code that you came up with. You need to show us what you've done.

Regards,

Paul McKenzie

//WAP to display
// 1
// 1 2 1
// 1 2 3 2 1
// 1 2 3 4 3 2 1
// 1 2 3 4 5 4 3 2 1
// achived:
// 1
// 1 2 1
// 1 2 3 2 1 0
// 1 2 3 4 3 2 1 0 -1
// 1 2 3 4 5 4 3 2 1 0 -1 -2

#include<iostream>
class hill
{
int row,space,col,a;
public:
void display()
{
for (row=1;row<=5;row++)
{
for (space=18;space>=row*2-1;space--)
{
cout<<" ";
}
for (col=1;col<=row;col++)
cout<<col<<" ";
// cout<<"\n";
for (a=col-2;a>=col*-1+4;a--)
// cout<<"\n";
cout<<a<<" ";
cout<<"\n";
}
}
};
void main()
{
hill formation;
formation.display();
return 0;
}

[siddharth_1202]

There is another program for which I have written a code but there is problem with it as the display is showing 51 infinite times.

//WAP to display prime numbers between 1 to 50.

#include<iostream>
class prime
{
int a,b,c;
public:
void display()
{
for (a=2;a<=50;a++)
// cout<<"\nEnter a number:";cin>>a;
b=2,c=0;
while (b<=a/2)
{
if (a%b==0)
{
b++;
}
else
{cout<<a;
cout<<", ";
b++;}
}

// if (c==1)
// {cout<<"\nNumber is not a prime number";}
// else
// {cout<<"\nNumber is a prime number";}
}
};
void main()
{
prime num;
num.display();
return 0;
}

[Paul McKenzie]

//WAP to display
// 1
// 1 2 1
// 1 2 3 2 1
// 1 2 3 4 3 2 1
// 1 2 3 4 5 4 3 2 1
// achived:
// 1
// 1 2 1
// 1 2 3 2 1 0
// 1 2 3 4 3 2 1 0 -1
// 1 2 3 4 5 4 3 2 1 0 -1 -2

Please use code tags when posting code.

#include<iostream>
class hill
{
	int row,space,col,a;
	public:
	void display()
	{
		for (row=1;row<=5;row++)
		{
				for (space=18;space>=row*2-1;space--)
				{	
					cout<<" ";
				}
				for (col=1;col<=row;col++)
				cout<<col<<" ";
//				cout<<"\n";
				for (a=col-2;a>=col*-1+4;a--)
//				cout<<"\n";
				cout<<a<<" ";
				cout<<"\n";
		}
	}
};
void main()
{
	hill formation;
	formation.display();
	return 0;
}

It's int main(), not void main().

int main()

Second, look at what the problem is in your output. You are looping too many times in the second loop. The easiest way to fix this is to print only if a is greater or equal to 1.

for (a=col-2; a>=1;a--)

Regards,

Paul McKenzie

[siddharth_1202]

Thanks a lot Paul, it works. I am very happy, thanks a lot for the help.
Can you please also suggest me what mistake am I making in the below mentioned program?

//WAP to display prime numbers between 1 to 50.

#include<iostream>
class prime
{
	int a,b,c;
	public:
	void display()
	{
		for (a=2;a<=50;)
		b=2,c=0;
		while (b<=a/2)
		{
			if (a%b==0)
			{
				b++;
			}
			else
			{
				cout<<a;
				cout<<", ";
				b++;
			}
		}	
		a++;
	}
};
int main()
{
	prime num;
	num.display();
	return 0;
}

[siddharth_1202]

Dear Friends,
Can you please help me with the following program?

//WAP to print 1 to 15 in different lines in incrementing manner.
// 1
// 2 3
// 4 5 6
// 7 8 9 10
// 11 12 13 14 15

#include<iostream>
class one
{
	int x,a;
	public:
	void display()
	{
		for (x=1;x<6;x++)
		{
			for (a=1;a<=x;a++)
			cout<<a;
			cout<<"\n";
		}
	}
};
void main()
{
one z;
z.display();
return 0;
}