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In this tutorial, we will write a C Program to display half hourglass patterns using numbers. Before that, you may go through the following topic in C.

• for loop in C

Half Hourglass number pattern in C

1. Left half hourglass number pattern

#include <stdio.h>

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

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = 1; j < i; j++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("%d", j);

    printf("\n");
  }

  for (i = rows - 1; i >= 1; i--)
  {
    for (j = 1; j < i; j++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("%d", j);

    printf("\n");
  }

  return 0;
}

Output:

Enter the number of rows: 5
12345
 2345
  345
   45
    5
   45
  345
 2345
12345

---

2. Right half hourglass number pattern

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = 1; j <= i; j++)
      printf("%d", j);

    printf("\n");
  }

  for (i = 2; i <= rows; i++)
  {
    for (j = 1; j <= i; j++)
      printf("%d", j);

    printf("\n");
  }

  return 0;
}

Output:

Enter the no. of rows: 5
12345
1234
123
12
1
12
123
1234
12345

---

In this tutorial, we will learn and write codes for various half pyramids number patterns in C programming language. However, in this tutorial, we will create a numeric pattern in C using for loop. So you may go through the following topic in C.

• for loop in C : loops plays a key role to achieve various patterns in any programming language. Mastering patterns means having excellent grasp at loops.

---

Left Half Pyramids in C using Numbers

We will look at the following topic of pyramid patterns in C. Each of the programs is consists of different number patterns.

• Left half pyramid
• Inverted left half pyramid

Left half pyramid pattern of numbers in C

Pattern 1:

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j < rows; j++)
      printf("  ");

    for (k = 1; k <= i; k++)
      printf(" %d", k);

    printf("\n");
  }

  return 0;
}

Output:

Enter the no. of rows: 5
         1
       1 2
     1 2 3
   1 2 3 4
 1 2 3 4 5

---

Inverted left half pyramid patterns of Numbers in C

Pattern 1:

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = 1; j <= i; j++)
      printf("  ");

    for (k = i; k <= rows; k++)
      printf(" %d", k);

    printf("\n");
  }

  return 0;
}

Output:

Enter the no. of rows: 5
   1 2 3 4 5
     2 3 4 5
       3 4 5
         4 5
           5

---

In this tutorial, we will learn and write codes for various half pyramids number patterns in C programming language. However, in this tutorial, we will create a numeric pattern in C using for loop. So you may go through the following topic in C.

• for loop in C : loops plays a key role to achieve various patterns in any programming language. Mastering patterns means having excellent grasp at loops.

---

Half Pyramid Number Pattern in C

We will look at the following topic of pyramid patterns in C. Each of the programs is consists of different number patterns.

• Right half pyramid
• Inverted right half pyramid

Right half Pyramid Pattern

Pattern 1: Also called the right triangle pattern.

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; ++i)
  {
    for (j = 1; j <= i; ++j)
    {
      printf("%d ", j);
    }

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5

---

Pattern 2:

#include <stdio.h>

int main()
{
  int rows, count = 1;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (int i = 1; i <= rows; i++)
  {
    for (int j = 1; j <= i; j++)
    {
      printf("%d ", count);
      ++count;
    }

    printf("\n");
  }

  return 0;
}

Enter the number of rows: 4
1
2 3
4 5 6
7 8 9 10

---

Pattern 3: Pattern with a binary number in C

#include <stdio.h>

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

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = 1; j <= i; j++)
    {
      if (j % 2 == 0)
        printf("0");
      else
        printf("1");
    }

    printf("\n");
  }

  return 0;
}

Enter the number of rows: 6
1
10
101
1010
10101
101010

---

Pattern 4: Right-angled triangle pattern

The patterns have a similar number in each row. It can also be called half pyramid number patterns in C.

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = 1; j <= i; j++)
      printf("%d ", i);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
1
2 2
3 3 3
4 4 4 4
5 5 5 5 5

---

Pattern 5:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = 1; j <= i; j++)
      printf("%d ", i *j);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 10
1
2 4
3 6 9
4 8 12 16
5 10 15 20 25
6 12 18 24 30 36
7 14 21 28 35 42 49
8 16 24 32 40 48 56 64
9 18 27 36 45 54 63 72 81
10 20 30 40 50 60 70 80 90 100

---

Pattern 6:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = rows; j >= i; j--)
      printf("%d ", j);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
5
5 4
5 4 3
5 4 3 2
5 4 3 2 1

---

Pattern 7:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = rows; j >= i; j--)
      printf("%d ", i);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
5
4 4
3 3 3
2 2 2 2
1 1 1 1 1

---

Inverted right half Pyramid Pattern

Pattern 1:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; --i)
  {
    for (j = 1; j <= i; ++j)
      printf("%d ", j);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 6
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

---

Pattern 2:

Half inverted right-angled triangle with decreasing order.

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = i; j >= 1; j--)
    {
      printf("%d ", j);
    }

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1

---

Pattern 3:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = 1; j <= i; j++)
      printf("%d ", i);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
5 5 5 5 5
4 4 4 4
3 3 3
2 2
1

---

Pattern 4:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = rows; j >= i; j--)
      printf("%d ", j);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
5 4 3 2 1
5 4 3 2
5 4 3
5 4
5

---

Pattern 5:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j <= rows; j++)
      printf("%d ", j);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
1 2 3 4 5
2 3 4 5
3 4 5
4 5
5

---

Pattern 6:

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j <= rows; j++)
      printf("%d ", i);

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
1 1 1 1 1
2 2 2 2
3 3 3
4 4
5

---

In this tutorial, we will write a C Program to display Pyramid patterns using numbers. Before that, you may go through the following topic in C.

• for loop in C

Full Pyramid Number Pattern in C

1. Full pyramid with mirror pattern of numbers.

#include <stdio.h>

int main()
{
  int i, j, rows, k = 0, count1 = 0, count2 = 0;

  printf("Enter the no of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; ++i)
  {
    for (j = 1; j <= rows - i; ++j)
    {
      printf("  ");
      ++count1;
    }

    while (k != 2 *i - 1)
    {
      if (count1 <= rows - 1)
      {
        printf("%d ", i + k);
        ++count1;
      }
      else
      {
        ++count2;
        printf("%d ", (i + k - 2 *count2));
      }

      ++k;
    }

    count2 = count1 = k = 0;
    printf("\n");
  }

  return 0;
}

Enter the no of rows: 6
          1 
        2 3 2 
      3 4 5 4 3 
    4 5 6 7 6 5 4 
  5 6 7 8 9 8 7 6 5 
6 7 8 9 10 11 10 9 8 7 6 

---

2. Full pyramid with repeating pattern of numbers.

#include <stdio.h>

int main()
{
  int rows, count = 1;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (int i = rows; i > 0; i--)
  {
    for (int j = 1; j <= i; j++)
      printf(" ");

    for (int j = 1; j <= count; j++)
      printf("%d ", count);

    printf("\n");

    count++;
  }

  return 0;
}

Enter the number of rows: 6
      1 
     2 2 
    3 3 3 
   4 4 4 4 
  5 5 5 5 5 
 6 6 6 6 6 6 

---

3. Full pyramid pattern of numbers.

#include <stdio.h>

int main()
{
  int rows, count = 1;

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (int i = rows; i > 0; i--)
  {
    for (int j = 1; j <= i; j++)
      printf(" ");

    for (int j = 1; j <= count; j++)
      printf("%d ", j);

    printf("\n");

    count++;
  }

  return 0;
}

Enter the number of rows: 6
      1 
     1 2 
    1 2 3 
   1 2 3 4 
  1 2 3 4 5 
 1 2 3 4 5 6

---

In this tutorial, we will write a C Program to display full hourglass patterns using numbers. Before that, you may go through the following topic in C.

• for loop in C

Hourglass number Pattern in C

#include <stdio.h>

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

  printf("Enter the number of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (int j = 1; j < i; j++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("%d ", j);

    printf("\n");
  }

  for (i = rows - 1; i >= 1; i--)
  {
    for (j = 1; j < i; j++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("%d ", j);

    printf("\n");
  }

  return 0;
}

Output:

Enter the number of rows: 6
1 2 3 4 5 6 
 2 3 4 5 6 
  3 4 5 6 
   4 5 6 
    5 6 
     6 
    5 6 
   4 5 6 
  3 4 5 6 
 2 3 4 5 6 
1 2 3 4 5 6

---

In this tutorial, we will write a C program to display a hollow inverted triangle star pattern. Before that, you may go through the following topics in C.

• for loop in C
• if..else statement in C

Inverted hollow Triangle Star pattern in C

It is also called Hollow Pyramid Star Pattern in C.

#include <stdio.h>

int main()
{
  int i, j, k, m = 1, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows; i >= 1; i--)
  {
    for (j = 1; j < m; j++)
      printf(" ");

    for (k = 1; k <= 2 *i - 1; k++)
    {
      if (k == 1 || k == 2 *i - 1 || i == rows)
        printf("*");
      else
        printf(" ");
    }
    m++;

    printf("\n");
  }

  return 0;
}

Output:

---

In this tutorial, we will learn and write a program in C to display the diagonal number pattern. So you may go through the following topic in C.

• for loop in C

Diagonal Number Pattern in C

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j < rows; j++)
      printf(" ");

    printf(" %d\n", i);
  }

  return 0;
}

Output:

---

#include <stdio.h>

int main()
{
  int i, j, k = 1, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= (2 *rows) - 1; i++)
  {
    for (j = 1; j <= (2 *rows) - 1; j++)
    {
      if (i == j || i + j == 2 *rows)
        printf(" %d", k);
      else
        printf("  ");
    }

    if (i < rows)
      k++;
    else
      k--;

    printf("\n");
  }

  return 0;
}

Output:

---

In this tutorial, we will write a program in C to display the diagonal star pattern. So you may go through the following topic in C.

• for loop in C

Diagonal Star Pattern in C

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  int m = (2 *rows) - 1;

  for (i = 1; i <= m; i++)
  {
    for (j = 1; j <= m; j++)
    {
      if (i == j || j == (m - i + 1))
        printf("*");
      else
        printf(" ");
    }
    printf("\n");
  }

  return 0;
}

Output:

---

In this tutorial, we will write a program to print half hourglass pattern in C. Before that, you may go through the following topic in C.

• for loop in C

1. Right half hourglass pattern in C

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = rows - 1; i >= 0; i--)
  {
    for (j = i; j >= 0; j--)
    {
      printf("* ");
    }
    printf("\n");
  }

  for (i = 0; i <= rows - 1; i++)
  {
    for (j = i; j >= 0; j--)
    {
      printf("* ");
    }
    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
* * * * *
* * * *
* * *
* *
*
*
* *
* * *
* * * *
* * * * *

---

2. Left half hourglass pattern in C

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  printf("Output: \n\n");
  //upper half
  for (i = 1; i <= rows; i++)
  {
    for (k = 1; k < i; k++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("*");

    printf("\n");
  }

  //lower half
  for (i = rows - 1; i >= 1; i--)
  {
    for (k = 1; k < i; k++)
      printf(" ");

    for (j = i; j <= rows; j++)
      printf("*");

    printf("\n");
  }

  return 0;
}

Output:

---

We will write two different patterns diamond shape programs in C. So you may go through the following topic in C first.

• for loop in C

1. Right half diamond pattern in C

#include <stdio.h>

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

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 0; i <= rows - 1; i++)
  {
    for (j = 0; j <= i; j++)
      printf("* ");

    printf("\n");
  }

  for (i = rows - 1; i >= 0; i--)
  {
    for (j = 0; j <= i - 1; j++)
      printf("* ");

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
*
* *
* * *
* * * *
* * * * *
* * * *
* * *
* *
*

---

2. Left half diamond pattern in C

#include <stdio.h>

int main()
{
  int i, j, k, rows;

  printf("Enter the no. of rows: ");
  scanf("%d", &rows);

  for (i = 1; i <= rows; i++)
  {
    for (j = i; j < rows; j++)
      printf(" ");

    for (k = 1; k <= i; k++)
      printf("*");

    printf("\n");
  }

  for (i = rows; i >= 1; i--)
  {
    for (j = i; j <= rows; j++)
      printf(" ");

    for (k = 1; k < i; k++)
      printf("*");

    printf("\n");
  }

  return 0;
}

Enter the no. of rows: 5
    *
   **
  ***
 ****
*****
 ****
  ***
   **
    *

---