Hacktoberfest-3/hollowButterflyPattern.c at master · CodingWithAmit-07/Hacktoberfest-3 · GitHub

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// Hollow Butterfly

#include <stdio.h>

int main(){
    int n;
    printf("Enter the no. of rows in the upper part of the pattern: ");
    scanf("%d", &n);
    for(int i=1;i<=n;i++){
        for(int j=1;j<=i;j++){
            if(j==1 || j==i){
                printf("*");
            }else{
                printf(" ");
            }

        }
        for(int j=1;j<=2*n-2*i;j++){
            printf(" ");
        }
        for(int j=1;j<=i;j++){
            if(j==1 || j==i){
                printf("*");
            }else{
                printf(" ");
            }

        }
        printf("\n");
    }
    for(int i=n;i>=1;i--){
        for(int j=1;j<=i;j++){
            if(j==1 || j==i){
                printf("*");
            }else{
                printf(" ");
            }

        }
        for(int j=1;j<=2*n-2*i;j++){
            printf(" ");
        }
        for(int j=1;j<=i;j++){
            if(j==1 || j==i){
                printf("*");
            }else{
                printf(" ");
            }

        }
        printf("\n");
    }
    return 0;
}