Hollow Triangle Pattern using nested while loop in C

In this tutorial, we will discuss a concept of Hollow Triangle Pattern using nested while loop in C

In this program, we are going to learn about how to display Hollow Tringle star pattern using nested while loop in C programming language

Here, we display some Hollow triangle Pattern program with coding using nested while loop and also program get input from the user using scanf() function in C programming language

The user can provide numbers as they wish and get the Hollow Triangle pattern according to their input.

Floyd’s triangle star pattern 1

Program 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,j,rows;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    i=1;
    while(i<=rows){//outer while loop
        j=1;
        while(j<=i){//inner for loop
        printf(" ");//print initial space

    if(j==1 || j==i ||i==rows )
        printf("*");//print star
    else
        printf(" "); //print inside space
    j++;;
}
i++;
printf("\n");//Move to the next line for print
    }
    return 0;
}

When the above code is executed, it produces the following results

Hollow Triangle Pattern using nested while — Floyd’s Triangle Pattern

Floyd’s triangle star pattern 2

Program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,j,rows;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    i=1;
    while(i<=rows){..outer for loop
        j=i;
        while(j<rows){
        printf(" ");//print space
        j++;
        }
        j=1;
        while(j<=i){

    if(j==i || j==1 ||i==rows )
        printf("*");//print star
    else
        printf(" ");//print space
    j++;;
        }
        i++;
printf("\n");//Move to the next line for print
}
getch();
    return 0;
}

When the above code is executed, it produces the following results

Floyd’s triangle star pattern 3

Program 3

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,j,rows;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    i=1;
    while(i<=rows){//outer for loop
        j=1;
        while(j<=rows){//inner for loop

    if(j==i || j==rows ||i==1 )
        printf("*");//print star
    else
         printf(" ");//print space
    j++;;
        }
        i++;
printf("\n");//Move to the next line for print
}
getch();
    return 0;
}

When the above code is executed, it produces the following results

Floyd’s triangle star pattern 4

Program 4

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i,j,rows;
    printf("Enter the number of rows\n");
    scanf("%d",&rows);
    i=1;
    while(i<=rows){//outer for loop
        j=i;
        while(j<=rows){//inner for loop

    if( i==1|| j==i || j==rows)
        printf("*");//print star
    else
        printf(" ");//print space
    j++;;
        }
        i++;
printf("\n");//Move to the next line for print
}
getch();
    return 0;
}

When the above code is executed, it produces the following results