In C, we can use for loop, while loop or do-while loops to print different number, alphabets or star patterns programs. The following programs demonstrate the same by creating triangle, rectangle or other patterns.
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Pattern 1 : Printing Floyd’s triangle pattern
Floyd’s triangle is a right-angled triangular array of natural numbers.
It is named after Robert Floyd.
It is defined by filling the rows of the triangle with consecutive numbers, starting with a 1 in the top left corner.
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
#include <stdio.h>
int main()
{
int i, j, k = 1;
for (i = 1; i <= 5; i++) {
for (j = 1; j < i + 1; j++) {
printf("%d ", k++);
}
printf("\n");
}
return 0;
}
Pattern 2 : Diamond shape composed of Star(*)
*
***
*****
*******
*********
*******
*****
***
*
#include <stdio.h>
int main()
{
int number, i, k, count = 1;
number = 5;
count = number - 1;
for (k = 1; k <= number; k++)
{
for (i = 1; i <= count; i++)
printf(" ");
count--;
for (i = 1; i <= 2 * k - 1; i++)
printf("*");
printf("\n");
}
count = 1;
for (k = 1; k <= number - 1; k++)
{
for (i = 1; i <= count; i++)
printf(" ");
count++;
for (i = 1; i <= 2 * (number - k) - 1; i++)
printf("*");
printf("\n");
}
return 0;
}
Pattern 3 : Diamond shape composed of Numbers
1
212
32123
4321234
32123
212
1
#include <stdio.h>
int main()
{
for (int i = 1; i <= 4; i++)
{
int n = 4;
for (int j = 1; j <= n - i; j++)
{
printf(" ");
}
for (int k = i; k >= 1; k--)
{
printf("%d", k);
}
for (int l = 2; l <= i; l++)
{
printf("%d", l);
}
printf("\n");
}
for (int i = 3; i >= 1; i--)
{
int n = 3;
for (int j = 0; j <= n - i; j++)
{
printf(" ");
}
for (int k = i; k >= 1; k--)
{
printf("%d", k);
}
for (int l = 2; l <= i; l++)
{
printf("%d", l);
}
printf("\n");
}
return 0;
}
Pattern 4
1
121
12321
1234321
#include <stdio.h>
int main ()
{
int num, space;
num = 5;
space = num - 1;
for (int i = 1; i <= num; i++)
{
for (space = 1; space <= (num - i); space++)
{
printf (" ");
}
for (int j = 1; j <= i; j++)
{
printf ("%d", j);
}
for (int k = (i - 1); k >= 1; k--)
{
printf ("%d", k);
}
printf ("\n");
}
return 0;
}
Pattern 5
1
22
333
4444
55555
#include <stdio.h>
int main ()
{
int count = 5;
for (int i = 1; i <= count; i++)
{
for (int j = 1; j <= i; j++)
{
printf ("%d", i);
}
printf ("\n");
}
return 0;
}
Pattern 6
1
12
123
1234
12345
1234
123
12
1
#include <stdio.h>
int main ()
{
int n = 5;
for (int i = 1; i < n; i++) {
for (int j = 1; j <= i; j++)
printf("%d", j);
printf("\n");
}
for (int i = n; i >= 0; i--) {
for (int j = 1; j <= i; j++)
printf("%d", j);
printf("\n");
}
printf("\n");
return 0;
}
Pattern 7
12345
1234
123
12
1
1
12
123
1234
12345
#include <stdio.h>
int main ()
{
int n = 5;
for (int i = n; i >= 0; i--) {
for (int j = 1; j <= i; j++)
printf("%d", j);
printf("\n");
}
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++)
printf("%d", j);
printf("\n");
}
printf("\n");
return 0;
}
Pattern 8
1
01
101
0101
10101
#include <stdio.h>
int main ()
{
int n, p, q;
n = 5;
for (int i = 1; i <= n; i++)
{
if (i % 2 == 0)
{ p = 1; q = 0; }
else
{ p = 0; q = 1; }
for (int j = 1; j <= i; j++)
if (j % 2 == 0)
printf("%d", p);
else
printf("%d", q);
printf("\n");
}
return 0;
}
Pattern 9
A
BB
CCC
DDDD
EEEEE
#include <stdio.h>
int main ()
{
char ch = 'A';
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
printf("%c", ch);
}
ch++;
printf("\n");
}
return 0;
}
Pattern 10
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
#include <stdio.h>
int main ()
{
int n= 5;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n - i; j++) {
printf(" ");
}
for (int k = 1; k <= i; k++) {
printf("%d", k);
printf(" ");
}
printf("\n");
}
return 0;
}
Pattern 11
5
54
543
5432
54321
#include <stdio.h>
int main ()
{
int i = 5;
while (i >= 1) {
int j = 5;
while (j >= i) {
printf("%d", j);
j--;
}
i--;
printf("\n");
}
return 0;
}
Pattern 12
1****
12***
123**
1234*
12345
#include <stdio.h>
int main ()
{
int i, j, k;
int n = 5;
for (i = 1; i <= n; i++) {
for (j = 1; j <= i; ++j)
printf("%d", j);
for (k = n - i; k >= 1; k--)
printf("*");
printf("\n");
}
return 0;
}
Pattern 13
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
#include <stdio.h>
int main ()
{
int i, j, k;
for (i = 1; i <= 5; i++) {
for (j = 1; j <= 5 - i; j++)
printf(" ");
for (k = 1; k <= i; k++){
printf("%d", k);
printf(" ");
}
printf("\n");
}
for (i = 1; i <= 4; i++) {
for (j = 1; j <= i; j++)
printf(" ");
for (k = 1; k <= 5 - i; k++){
printf("%d", k);
printf(" ");
}
printf("\n");
}
return 0;
}
Pattern 14
********
*******
******
*****
****
***
**
*
#include <stdio.h>
int main ()
{
for (int row = 8; row >= 1; --row) {
for (int col = 1; col <= row; ++col) {
printf("*");
}
printf("\n");
}
return 0;
}
Pattern 15:
*
**
***
****
*****
******
*******
********
#include <stdio.h>
int main ()
{
for (int row = 1; row <= 8; ++row) {
for (int col = 1; col <= row; ++col) {
printf("*");
}
printf("\n");
}
return 0;
}
Pattern 16 :
*
***
*****
*******
*********
***********
*************
#include <stdio.h>
int main ()
{
int number = 7;
int count = number - 1;
for (int k = 1; k <= number; k++) {
for (int i = 1; i <= count; i++)
printf(" ");
count--;
for (int i = 1; i <= 2 * k - 1; i++)
printf("*");
printf("\n");
}
return 0;
}
Pattern 17: Diamond Pattern
*
***
*****
*******
*********
*******
*****
***
*
#include <stdio.h>
int main ()
{
int number = 5;
int count = number - 1;
for (int k = 1; k <= number; k++) {
for (int i = 1; i <= count; i++)
printf(" ");
count--;
for (int i = 1; i <= 2 * k - 1; i++)
printf("*");
printf("\n");
}
count = 1;
for (int k = 1; k <= number - 1; k++) {
for (int i = 1; i <= count; i++)
printf(" ");
count++;
for (int i = 1; i <= 2 * (number - k) - 1; i++)
printf("*");
printf("\n");
}
return 0;
}
Pattern 18:
*
**
***
****
*****
******
*******
********
#include <stdio.h>
int main ()
{
int val = 8;
for (int i = 1; i <= val; i++) {
for (int j = 1; j <= val - i; j++) {
printf(" ");
}
for (int k = 1; k <= i; k++) {
printf("*");
}
printf("\n");
}
return 0;
}
Pattern 19:
* *
** **
*** ***
**** ****
***** *****
****** ******
******* *******
******** *********
#include <stdio.h>
int main ()
{
int number = 8;
for (int i = 0; i < number; ++i) {
for (int j = 0; j <= i; ++j) {
printf("*");
}
if (i != number - 1) {
printf(" ");
} else {
printf(" *");
}
for (int j = 0; j <= i; ++j) {
printf("*");
}
printf("\n");
}
return 0;
}
Pattern 20:
*******
* *
* *
* *
* *
* *
*******
#include <stdio.h>
int main ()
{
int number = 7;
for (int i = 0; i < number; i++) {
if (i == 0 || i == 6) {
for (int j = 0; j < number; j++) {
printf("*");
}
printf("\n");
}
if (i >= 1 && i <= 5) {
for (int j = 0; j < number; j++) {
if (j == 0 || j == 6) {
printf("*");
} else if (j >= 1 && j <= 5) {
printf(" ");
}
}
printf("\n");
}
}
return 0;
}
Pattern 21:
* ***************** *
** ******** ******* **
*** ******* ****** ***
**** ****** ***** ****
***** ***** **** *****
****** **** *** ******
******* *** ** *******
********** *********
#include <stdio.h>
void stars(int count) {
for (int i = 0; i < count; ++i)
printf("*");
return 0;
}
void spaces(int count) {
for (int i = 0; i < count; ++i)
printf(" ");
return 0;
}
int main ()
{
int n = 8;
for (int i = 0; i < n; ++i) {
stars(i + 1);
spaces(n - i - 1);
stars(n - i + 1);
spaces(2 * i);
stars(n - i);
spaces(n - i - 1);
stars(i + 1);
printf("\n");
}
return 0;
}
Pattern 22:
1 2 3 4 5
2 3 4 5
3 4 5
4 5
5
4 5
3 4 5
2 3 4 5
1 2 3 4 5
#include <stdio.h>
int main ()
{
int n = 5;
for (int i = 1; i <= n; i++)
{
for (int j = i; j <= n; j++)
{
printf("%d", j);
printf(" ");
}
printf("\n");
}
for (int i = n-1; i >= 1; i--)
{
for (int j = i; j <= n; j++)
{
printf("%d", j);
printf(" ");
}
printf("\n");
}
return 0;
}
Pattern 23:
1 2 3 4 5
2 3 4 5
3 4 5
4 5
5
4 5
3 4 5
2 3 4 5
1 2 3 4 5
#include <stdio.h>
int main ()
{
int n = 5;
for (int i = 1; i <= n; i++)
{
for (int j = 1; j < i; j++)
{
printf(" ");
}
for (int k = i; k <= n; k++)
{
printf("%d", k);
printf(" ");
}
printf("\n");
}
for (int i = n-1; i >= 1; i--)
{
for (int j = 1; j < i; j++)
{
printf(" ");
}
for (int k = i; k <= n; k++)
{
printf("%d", k);
printf(" ");
}
printf("\n");
}
return 0;
}
Pattern 24:
A
BC
DEF
GHIJ
KLMNO
#include <stdio.h>
int main ()
{
char ch = 'A';
for (int i = 1; i <= 5; i++) {
for (int j = 1; j <= i; j++) {
printf("%c", ch);
ch++;
}
printf("\n");
}
return 0;
}
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