30-Mario.md

Mario

Introduction

Let’s recreate that pyramid in C, albeit in text, using hashes (#) for bricks, a la the below. Each hash is a bit taller than it is wide, so the pyramid itself is also be taller than it is wide.

The program we’ll write will be called mario. And let’s allow the user to decide just how tall the pyramid should be by first prompting them for a positive integer between, say, 1 and 8, inclusive.

Here’s how the program might work if the user inputs 8 when prompted:

./mario
Height: 8
#
##
###
####
#####
######
#######
########

Here’s how the program might work if the user inputs 4 when prompted:

$ ./mario
Height: 4
#
##
###
####

Here’s how the program might work if the user inputs 2 when prompted:

$ ./mario
Height: 2
#
##

And here’s how the program might work if the user inputs 1 when prompted:

$ ./mario
Height: 1
#

This is a simple challenge, but if you want to take on a more difficult one, try it on the website.

goal

1. First, create a new file, it called mario.c.
2. use scanf to get a integer.
3. Keep in mind that a hash is just a character like any other, so you can print it with printf.
4. You can actually “nest” loops, iterating with one variable (e.g., i) in the “outer” loop and another (e.g., j) in the “inner” loop. For instance, here’s how you might print a square of height and width n, below. Of course, it’s not a square that you want to print!

reminder

• scanf
• printf
• for loop
• positive integer

reference code

The following content is for reference only. In order to have a better learning effect, please try to complete the exercises according to your own ideas.

reference

# include <stdio.h>

void main(){
    int n;
    printf("Height:");
    scanf("%d",&n);
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < i+1; j++)
        {
            printf("#");
        }
    printf("\n");
    }
}