10 different alphabet pattern programs in C

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: 5A 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: 5A A A A A B B B B C C C D D E Enter the height of the pattern: 6A 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

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: 5A B C D E A B C D A B C A B A Enter the height of the pattern: 6A 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;}

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: 7G 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 O

The 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: 5A 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: 6A 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: 5A B C C D E D E F G E F G H I Enter the height of the pattern: 8A 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 H I J K L M N O

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