Create a Triangle with Asterisks in C: Step-by-Step Guide

[RicardoMarques]

< Mentor Note -- code tags have been added for better readability. In the future, please use code tags. Thank you. >

1. Homework Statement

#include <stdio.h>

void escreve_linha(int n)
{
    int i;
    for( i = 0 ; i < n ; i++ ) {
        printf("*");
    }
    printf("\n");
}

void escreve_quadrado(int n)
{
    int i;
    for( i = 0 ; i < n ; i++ ) {
        escreve_linha(n);
      
    }
}

int main(void)
{
    int lado;
    printf("Qual o tamanho do lado? ");
    scanf("%d", &lado);
    escreve_quadrado(lado);
    return 0;
}

How do I turn this code into a triangle with asteriscs like this:
*
**
***
****

Going on and on...?

Homework Equations

There are no equations

The Attempt at a Solution

I tried to change the parameters but has been way too difficult

 

[lewando]

You would need to create a function escreve_triangulo(int n), where n is the number of layers.

It would be similar in structure to escreve_quadrado(), except instead of calling escreve_linha(n), where n is not changing, you would need to call that function with an incrementing value. Note: you already have an incrementing value: i.

 

[RicardoMarques]

Can you show me how please ? I'm really confused about this

 

[DrClaude]

Can you show me how please ? I'm really confused about this

It's going to be hard to help you with this without doing the work for you. Review what escrivo_quadrando does, and you should see what small modification is needed.

 

[RicardoMarques]

I am studying for a frequency, getting the answer would be ok... I have no time to ask my professor, and I'm really confused

 

[lewando]

Do you understand how the original program works? If not, what parts are confusing?

If you can provide more details about what is confusing you, we can work on those details.

 

[RicardoMarques]

I cannot understand what are the changes that I need to do to make a triangle, i tried a lot of things and nothing seems to work

 

[lewando]

Please answer this very important question: Do you understand how the original program works?

 

[berkeman]

I am studying for a frequency, getting the answer would be ok... I have no time to ask my professor,

No, it is against the Physics Forums rules for us to give you answers to your schoolwork assignments. You will need to do the work yourself, based on our questions and hints. That's how the PF works.

 

[RicardoMarques]

I cannot understand what are the changes that I need to do to make a triangle, i tried a lot of things and nothing seems to work

Please answer this very important question: Do you understand how the original program works?

Yes I do.

No, it is against the Physics Forums rules for us to give you answers to your schoolwork assignments. You will need to do the work yourself, based on our questions and hints. That's how the PF works.

You misunderstood me. I want to get the answer, but by myself... But I clearly need a little bit of help now, since I'm stuck. I haven't understand clearly the hints you are giving me.

 

[lewando]

... i tried a lot of things and nothing seems to work

What have you tried? Please be specific.

 

[berkeman]

And what output do you get when you run the program that you posted?

 

[RicardoMarques]

And what output do you get when you run the program that you posted?

A square

 

[berkeman]

A square

Then this is the key hint for how to get a triangle instead...

It would be similar in structure to escreve_quadrado(), except instead of calling escreve_linha(n), where n is not changing, you would need to call that function with an incrementing value. Note: you already have an incrementing value: i.

 

[RicardoMarques]

What have you tried? Please be specific.

I tried to change the function escreve_linha , but i need to keep the parameters i and n..

 

[RicardoMarques]

I got it thank you !

Edit:

void escreve_linha(int i)
{
   int j ;
    for( j = 0 ;  j <= i ; j++ ) {
        printf("*");
    }
    printf("\n");
}
}

 

[RicardoMarques]

What would be the hint, if i wanted to put it this way:
****
***
**
*

 

[berkeman]

What would be the hint, if i wanted to put it this way:
****
***
**
*

You tell us! Looks like you are getting the hang of it...

 

[RicardoMarques]

You tell us! Looks like you are getting the hang of it...

If use both parameters in escreve_linha like escreve_linha(int i, int n) is that ok ?
If it is , I am thinking in something like for( n; n>i; n--)

 

[berkeman]

for( n; n>i; n--)

That's not quite correct, but you are on the right track...

 

[RicardoMarques]

I wrote this and it worked, what can I change to make the code better ?

void escreve_linha(int i, int n)
{
   
    for( n ;  n > i ; n-- ) {
        printf("*");
       ;
    }
    printf("\n");
}

}

 

[berkeman]

If the syntax was accepted and it worked, then it's fine. I thought the initializer in the for() statement looked wrong, but if the compiler took it and it worked, then I think you're good.

 

[RicardoMarques]

If the syntax was accepted and it worked, then it's fine. I thought the initializer in the for() statement looked wrong, but if the compiler took it and it worked, then I think you're good.

Long night waiting, going for the 20 :)
Thank you guys !