C Program To Display Right Angled Triangle With Alphabets, using While Loop

Lets write a C program to display/print/output a right angled triangle pattern formed with English Alphabets, using nested while loop.

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Expected Output for the Input

If user enters number of rows as 5. Then our C program prints a Right angled Triangle with 5 rows of English Alphabets in it.

User Input:
num = 5;

Output:

A
B B
C C C
D D D D
E E E E E

Video Tutorial: C Program To Print Right Angled Triangle With Alphabets, using While Loop

Logic To Display Right Angled Triangle With Alphabets, using While Loop

If we take a closer look at the right angled triangle, we can see that the number of rows and the number of elements in that row are same. Example, row number 5 has 5 elements. Row number 6 has 6 elements etc. So we store this number in a variable called row. Since row starts from 1, we initialize the variable row to 1.

We ask the user to enter the maximum number of rows for the right angled triangle, and store it in address of variable num. In outer while loop we check if value of row is less than or equal to num. For each iteration of the outer while loop we increment the value of row by 1.

Inside the outer while loop we initialze the variable start to 1 – to print the alphabets from position 1 for that particular row number present in variable row. We increment the value of start by 1 for each iteration of inner while loop. Inside inner while loop we print the alphabets using ASCII value of upper case English Alphabets.

Related Read:
C Program To Print All ASCII Characters and Code

ASCII Values of uppercase English Alphabets

ASCII value of A is 65

ASCII value of B is 66

ASCII value of C is 67

ASCII value of D is 68

ASCII value of E is 69

ASCII value of F is 70

ASCII value of G is 71

ASCII value of H is 72

ASCII value of I is 73

ASCII value of J is 74

ASCII value of K is 75

ASCII value of L is 76

ASCII value of M is 77

ASCII value of N is 78

ASCII value of O is 79

ASCII value of P is 80

ASCII value of Q is 81

ASCII value of R is 82

ASCII value of S is 83

ASCII value of T is 84

ASCII value of U is 85

ASCII value of V is 86

ASCII value of W is 87

ASCII value of X is 88

ASCII value of Y is 89

ASCII value of Z is 90

Source Code: C Program To Display Right Angled Triangle With Alphabets, using While Loop

#include<stdio.h>

int main()
{
    int num, row = 1, start;

    printf("Enter no of rows\n");
    scanf("%d", &num);

    printf("\n");
    while(row <= num)
    {
        start = 1;
        while(start <= row)
        {
            printf("%c  ", (row+64));
            start++;
        }
        printf("\n");
        row++;
    }

    return 0;
}

Output 1:
Enter no of rows
5

A
B B
C C C
D D D D
E E E E E

Output 2:
Enter no of rows
10

A
B  B
C  C  C
D  D  D  D
E  E  E  E  E
F  F  F  F  F  F
G  G  G  G  G  G  G
H  H  H  H  H  H  H  H
I  I  I  I  I  I  I  I  I
J  J  J  J  J  J  J  J  J  J

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