1
12
123
1234
12345
/**
* C program to print number pattern
* www.atnyla.com
*/
#include <stdio.h>
int main()
{
int i, j, N;
printf("Enter N: ");
scanf("%d", &N);
for(i=1; i<=N; i++)
{
// Logic to print spaces
for(j=1; j<=N-i; j++)
{
printf(" ");
}
// Logic to print numbers
for(j=1; j<=i; j++)
{
printf("%d", j);
}
printf("\n");
}
return 0;
} 1
12
123
1234
12345
1 12 123 1234 12345
The above pattern is very much similar to the previous pattern we just printed. We only need to add logic to print trailing spaces that should be printed before the number gets printed.
If you hover your mouse on to the pattern you can see or count total spaces per row and can also think of logic to print the spaces. If you can notice, there are exactly N - i spaces per row (where N is the total number of rows to be printed and i is the current row number.
The step-by-step descriptive logic to print spaces is:
Lets now code this.
First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.