10 different alphabet pattern programs in C:
In this post, we will learn how to print 10 different alphabet patterns in C. Let’s learn these patterns one by one:
Pattern 1:
A
B B
C C C
D D D D
E E E E E We will use two loops to print this pattern: one outer loop and one inner loop. The outer loop will point to each row of the pattern and the inner loop will print the characters.
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = 0; j <= i; j++)
{
printf("%c ", 'A' + i);
}
printf("\n");
}
return 0;
}- This program takes the height as an input from the user and assigns it to the height variable.
- The for loop with i points to each row of the pattern and the for loop with j is used to print the characters.
It will print output as below:
Enter the height of the pattern: 5
A
B B
C C C
D D D D
E E E E E Pattern 2:
A A A A A
B B B B
C C C
D D
E This is similar to the above example. But the inner loop will run in reverse.
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = height; j > i; j--)
{
printf("%c ", 'A' + i);
}
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 5
A A A A A
B B B B
C C C
D D
E
Enter the height of the pattern: 6
A A A A A A
B B B B B
C C C C
D D D
E E
F Pattern 3:
A
A B
A B C
A B C D
A B C D E This is similar to the first pattern. The only change is the inner loop, it will add j to A to print the current character of each row.
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = 0; j <= i; j++)
{
printf("%c ", 'A' + j);
}
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 5
A
A B
A B C
A B C D
A B C D E Pattern 4:
A B C D E
A B C D
A B C
A B
A This is the reverse pattern of pattern 3. We need to change the inner loop to print it:
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = 0; j < height - i; j++)
{
printf("%c ", 'A' + j);
}
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 5
A B C D E
A B C D
A B C
A B
A
Enter the height of the pattern: 6
A B C D E F
A B C D E
A B C D
A B C
A B
A Pattern 5:
A
B A
C B A
D C B A
E D C B A Below program prints this:
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = i + 1; j > 0; j--)
{
printf("%c ", 'A' + j - 1);
}
printf("\n");
}
return 0;
}It will print:
Enter the height of the pattern: 5
A
B A
C B A
D C B A
E D C B A Pattern 6:
G F E D C B A
F E D C B A
E D C B A
D C B A
C B A
B A
A It is the reverse pattern of pattern 5. The below program prints this:
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = height - i; j > 0; j--)
{
printf("%c ", 'A' + j - 1);
}
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 7
G F E D C B A
F E D C B A
E D C B A
D C B A
C B A
B A
A Pattern 7:
A
B C
D E F
G H I J
K L M N OThe characters are changing continuously in this pattern. So, we will use a separate character variable to hold the current character to print.
#include <stdio.h>
int main()
{
int height;
char c = 'A';
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
for (int j = 0; j <= i; j++)
{
printf("%c ", c);
c++;
}
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 5
A
B C
D E F
G H I J
K L M N O Pattern 8:
A
B G
C H L
D I M P
E J N Q S
F K O R T U The below program prints this pattern:
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
int diff = height - 1;
int c = i;
for (int j = 0; j <= i; j++)
{
printf("%c ", (char)(c + 65));
c += diff;
diff--;
}
c++;
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 6
A
B G
C H L
D I M P
E J N Q S
F K O R T U Pattern 9:
A
A B A
A B C B A
A B C D C B A
A B C D E D C B A The below C program can print this pattern for different heights:
#include <stdio.h>
int main()
{
int height;
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 1; i <= height; i++)
{
for (int j = 0; j < height - i; j++)
{
printf(" ");
}
for (int j = 1; j <= i; j++)
{
printf("%c ", (char)(j + 64));
}
for (int j = i - 1; j >= 1; j--)
{
printf("%c ", (char)(j + 64));
}
printf("\n");
}
return 0;
}
Pattern 10:
A
B C
C D E
D E F G
E F G H I For this pattern, we will store the starting character of each row in a different variable. Then we will assign it to a temporary variable and use it to print the row characters. At the end of each row print, it will be incremented by 1 to change.
#include <stdio.h>
int main()
{
int height;
char c = 'A';
printf("Enter the height of the pattern: ");
scanf("%d", &height);
for (int i = 0; i < height; i++)
{
char charToPrint = c;
for (int j = 0; j <= i; j++)
{
printf("%c ", charToPrint);
charToPrint++;
}
c++;
printf("\n");
}
return 0;
}Output:
Enter the height of the pattern: 5
A
B C
C D E
D E F G
E F G H I
Enter the height of the pattern: 8
A
B C
C D E
D E F G
E F G H I
F G H I J K
G H I J K L M
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