Logic to print the given number pattern 1 21 321 4321 54321

🚀 Programming Example

Logic to print the given number pattern

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💻 Practical Program

📘 Step Learning

Write a C program to print the given number pattern using for loop. How to print the given triangular number pattern using for loop in C programming. Logic to print the given number pattern using loop in C program.

💻 Program Code

/**
 * C program to print number pattern
 */

#include <stdio.h>

int main()
{
    int i, j, N;

    printf("Enter N: ");
    scanf("%d", &N);

    for(i=1; i<=N; i++)
    {
        // Logic to print numbers
        for(j=i; j>=1; j--)
        {
            printf("%d", j);
        }

        printf("\n");
    }

    return 0;
}

🖥 Program Output

Enter N: 5
1
21
321
4321
54321

📘 Explanation

Logic to print the given number pattern

To get the logic of the given pattern look to the pattern carefully for a minute. If you have noticed the pattern consists of N rows (where N is the total number of rows to be printed). Each row contains exactly icolumns (where i is the current row number). Since the columns are printed in descending order hence, you must run the loop from i to 1 and print the value of j (where j is the current column number).

Step-by-step descriptive logic of the pattern:

To iterate through rows, run an outer loop from 1 to N (where N is the total number of rows to be printed).
To print the columns, run an inner loop from i to 1 in decreasing order (where i is the current row number). Since the values printed per row is in decreasing order hence we have used the loop from N-1 otherwise we can also use the loop from 1-N.
Inside this loop print the value of j (where j is the current column number).

Lets now implement this logic.

🎯 How to learn from this example

First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.

🔥 Practice suggestion

Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.

Logic to print the given number pattern
1 21 321 4321 54321

💻 Program Code

🖥 Program Output

📘 Explanation

Logic to print the given number pattern

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