TRIANGULAR NUMBER OR NOT

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Consider the following I/O samples.



SAMPLE INPUT: 10

SAMPLE OUTPUT:  TRIANGULAR NUMBER


The TRIANGULAR NUMBER sequence is the representation of the numbers in the
 form of equilateral triangle arranged in a series or sequence. These numbers are in a 
 sequence of 1, 3, 6, 10, 15, 21, 28, 36, 45, and so on.



                 



C PROGRAM:

#include <stdio.h>

int main()

{

    int num,i,flag=0;

    scanf("%d",&num);

    for(i=1;i<=num/2+1;i++)

    {

        if((i*(i+1))/2 == num)
        
        {
            
            flag=1;
            
            break;
            
        }

    }

    if(flag == 1)

        printf("TRIANGULAR NUMBER");

    else

        printf("NOT A TRIANGULAR NUMBER");
        
    return 0;

    
}




OUTPUT:


                 




The given source code in C program "FOR TRIANGULAR NUMBER OR NOT" is short and simple to understand. The source code is well tested in DEV-C++ and is completely error free. 
If you have any feedback about this article and want to improve this, please comment in the comment section.


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