How to print a character , between output numbers

Question

1.00/5 (1 vote)

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this code is for a program that prints the prime numbers between two specific us and characters must be printed , my does not print character ,

What I have tried:

C

#include <stdio.h>;

int main()
{
    int i, j, start, end;
    int isPrime;
  
    scanf("%d", &start);
    
    scanf("%d", &end);

    if(start < 2) 
        start = 2;
  
    for(i=start; i<=end; i++)
    {
        isPrime = 1; 
       
        for(j=2; j<=i/2; j++)
        {
            if(i%j==0)
            {
                isPrime = 0;
                break;
            }
        }
		
        if(isPrime==1 )
        {
            printf("%d,", i);
        }
    }

    return 0;
}

Posted 25-Apr-21 2:11am

zolializadeh

Updated 25-Apr-21 4:30am

Dave Kreskowiak

v2

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Comments

Patrice T 25-Apr-21 8:38am

In html, '<' have a special meaning and need to be encoded to avoid problems.
Use Improve question to update your question.

Richard MacCutchan 25-Apr-21 8:49am

When I run your code I get the following result:

C:\Users\rjmac\Documents\VSCode\C++>cp
1
17
2,3,5,7,11,13,17,

What is the problem?

Also, please edit your question to remove those spurious characters.

2 solutions

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Patrice T · Answer 1 · 2021-04-25T02:52:00

Solution 1

Quote:
How to print a character , between output numbers

Can you give more details ?
Because actually, your code just print a comma between primes.

Posted 25-Apr-21 2:52am

Patrice T

OriginalGriff · Answer 2 · 2021-04-25T03:20:00

Instead of always printing like this:

C

printf("%d,", i);

you need to be a little cleverer - ort you list will always end with a comma:

2, 3, 5, 7, 11, 13, 17,

So ... set a variable before the loop to zero and check it in the loop:

C

if (isPrime)
   {
   if (isNotFirst)
      {
      printf(",");
      }
   printf("%d", i);
   isNotFirst = 1;