Hollow triangle pattern in C programming

Hollow triangle patterns in C programming

In this tutorial, we will discuss How to create hollow triangle pattern in C programming language

We can print many types of Floyd’s triangle pattern using nested for loop in C language

We describe four hollow patterns in this post

Hollow triangle star patterns in C language

Pattern 1

Hollow triangle Program 1

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

int main()
{
    int i,j,rows;//variable declaration
    //Input row value from user
    printf("Enter of rows you want\n");
    scanf("%d",&rows);
    for(i=1; i<=rows; i++){//parent for loop
        for(j=i; j<=rows; j++){//print columns
            if(i==1 || j==i || j==rows){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");//move to next line
    }
    getch();
    return 0;
}

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

Hollow triangle pattern in C programming — Hollow triangle pattern 1

Program 2

Hollow triangle pattern 2

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

int main()
{
    int i,j,rows;//variable declaration
    //Input row value from user
    printf("Enter of rows you want\n");
    scanf("%d",&rows);
    for(i=1; i<=rows; i++){//parent for loop, for row of hollow triangle
        for(j=1; j<=i; j++){//print columns
            if(j==1 || j==i || i==rows){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");//move to next line
    }
    getch();
    return 0;
}

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

Program 3

Hollow triangle pattern 3

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

int main()
{
    int i,j,rows;//variable declaration
    printf("Enter the number of rows you want: ");
    scanf("%d",&rows);//get input from user for rows
    for(i=1; i<=rows; i++){
        for(j=1; j<i; j++){
            printf(" ");

        }
        for(j=i; j<=rows; j++){
            if(j==i || j==rows || i==1){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");//move to next line for iterate
    }
    getch();
    return 0;
}

Program 4

Hollow triangle pattern 4

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

int main()
{
    int i,j,rows;
    printf("Enter the number of rows you want: ");
    scanf("%d",&rows);//get input from user for rows
    for(i=1; i<=rows; i++){
        for(j=i; j<rows; j++){
            printf(" ");//print space for triangle

        }
        for(j=1; j<=i; j++){
            if(i==rows || j==1 || j==i){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");//move to next line for iterate
    }
    getch();
    return 0;
}

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