CODEWITHSUNDEEP
cloopscounting
Joemo
Joemo

Reputation: 65

C looping counting up

I'm a beginner at C and can't find the answer to this anywhere because I don't know how to word it so I'm just going to ask a question. I understand basic looping but what I want to do is make a small program where the output is this using only loops:

my code so far

int x;
int y = 1;

for (x=1; x<=5; x++)
{
        while(y<=5)
        {
            printf("%d", y);
            y++;
        }
}

this is what I have so far and don't know where to go next, if anyone could help I'd be grateful.

Upvotes: 3

Views: 2003

Answers (6)

Daniel Ojeda
Daniel Ojeda

Reputation: 101

You need to make 2 changes to your outer loop in order to get the expected output.

  1. for (x=1; x<=5; x++) should be for (x=1; x<=5; x--) because your program will count up to 5 the first time, 4 the second time, 3 the third time, etc..
  2. You should include printf("\n") so a new line is printed after each sequence is output.

You need to make 1 change to your inner loop as well:

  1. Instead of y <= 5 you should say y <= x because x will always be equal to the last number that you want to print since you're decrementing it in the outer loop.

Upvotes: 1

Ritvik Singh
Ritvik Singh

Reputation: 21

This is another solution using just a FOR loop with Integer Division. Try:

#include <stdio.h>

int main(void){

    int n= 12345, i;

    for(i=n;i>0;i/=10){
        printf("%d\n",i);
    } 

    return 0;
}

Upvotes: 2

Alex Lop.
Alex Lop.

Reputation: 6875

Another solution is to use integer division and use one single loop:

int x = 12345;

// repeat this loop as long as x != 0
while (x)
{
    printf("%d\n", x);
    x /= 10; // x = x/10;
}

Upvotes: 1

chux
chux

Reputation: 154080

For fun: another approach that simply divides each loop. But use best answer

int main(void) {
  int x = 12345;
  do {
    printf("%d\n", x);
    x /= 10;
  } while (x);
  return 0;
}

Output

12345
1234
123
12
1

Upvotes: 1

Haris
Haris

Reputation: 12270

You have to see the pattern you want and apply it in the loops to get it.

You need the output 12345 1234 123 12 1. So, the first iteration should start at 1 and go till 5, second should start at 1 and go till 4, and so on..

So, the outer loop should give the end limits for the inner loop, and the inner one should always start with 1.

Try 

for (x=5; x>=1; x--)
{
    y = 1;              // because the number always start with 1
    while(y<=x)
    {
        printf("%d", y);
        y++;
    }
    printf("\n");       //to go to next line
}

Upvotes: 1

dbush
dbush

Reputation: 224207

Close. Your outer loop needs to count down, not up, and your inner loop needs to count from 1 to x.

int x, y;

for (x=5; x>=1; x--)
{
    for (y=1;y<=x;y++)
    {
        printf("%d", y);
    }
    printf("\n");
}

Upvotes: 5

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