Print out * pattern (star pattern)

[lanzslumber]

Hi all.
I am new in C language. I am learning to program by using C for my first step. Now I am reading a chapter about looping (while, for, do.. while, nested loop).

In my exercise book, the question is about to:
Using nested loop to print out this one,

But, I managed to print like this one,

by using this code,

#include <stdio.h>
int main(void)
{
    int x;
    int y;
    for(x=1; x<=5; ++x)
    {
        for(y=x; y<=5; ++y)
        {
            printf("*");
        }
        printf("\n");
    }

    return 0;
}

How can I print out like a first one??

Thank you.

P/s: Sorry for my bad English.

[lanzslumber]

Why my images look messy?

[lanzslumber]

Also can someone show me the mechanism (or maybe the data structure, pseudocode, etc) of inner loop depend on outer loop. I still don't understand about the 'inner loop depend on outer loop' mechanisms. How the calculations behind that or logical step or etc.....

[deceptikon]

Why my images look messy?

Because we use CSS to align the images, it's not like a Word document. You'll need to organize the post so that it doesn't look goofy, much like you would in a web page. Note that we include a live preview underneath your post to facilitate proofreading.

I still don't understand about the 'inner loop depend on outer loop' mechanisms. How the calculations behind that or logical step or etc.....

I suspect what is meant is that the inner loop uses the counter from the outer loop:

#include <stdio.h>

int main(void)
{
    int i, j;

    for (i = 0; i < 5; i++) {
        for (j = 0; j <= i; j++) {
            putchar('*');
        }

        puts("");
    }

    return 0;
}

And to answer your first question, use two nested loops in sequence where the first prints spaces and the second prints stars:

#include <stdio.h>

int main(void)
{
    int i, j;

    for (i = 1; i <= 5; i++) {
        for (j = 1; j <= 5 - i; j++) {
            putchar(' ');
        }

        for (j = 1; j <= i; j++) {
            putchar('*');
        }

        puts("");
    }

    return 0;
}

[lanzslumber]

HI... after practice and practice, I am now able to generate and also understand the concept nearly all the pyramid patterns by using looping (for loop)....
credit to:
-> @deceptikon
-> http://cprogrammingcodes.blogspot.com/p/pyramid.html
-> C Primer Plus 5th Edition (2004) (Publisher: SAMS)

:D

p/s: sorry for my bad ENglish.

[deceptikon]

You missed the most amusing pattern (in my opinion):

#include <stdio.h>

void triangle(size_t n)
{
    for (size_t i = 0; i < n; i++) {
        for (size_t j = 0; j < n - i - 1; j++) {
            putchar(' ');
        }

        for (size_t j = 0; j <= i; ++j) {
            printf("%-2c", ~i & j ? ' ' : '1');
        }

        putchar('\n');
    }
}

int main(void)
{
    triangle(16);
    return 0;
}

[markanderson4]

Check this star triangle pattern program:
*
* *
* * *
* * * *
* * * * *
* * * * * *

#include<stdio.h>
#include<conio.h>

int main() {
    int i,j,rows;
    printf("Enter the number of rows\n");
    scanf("%d", &rows);

    for(i = 1; i <= rows; i++) {
    /* Prints one row of triangle */
        for(j = 1; j <= i; ++j) {
           printf("* ");
        }
        printf("\n");
    }
    getch();
    return 0;
}

Source : Triangle star pattern in C
You can find more pattern programs here C Pattern Programs
Hope it helps.