Why is my program printing more prime no.s than those which are expected | Basic C Programming

Question

https://code.sololearn.com/cQZudLLXtQpm/?ref=app

I’ll be really grateful if some one out there spare some time to check my code and spot the error in this simple basic code.

Answer 1

The problem lies in this line 👇
scanf("enter a number %d", &n);

If you work with that, then suppose you want to print prime numbers upto 20, your input should be "enter a number 20"

You can try this instead
scanf("%d enter a number", &n);
Now you only need to input a number

But it's better if you do this 👇
printf("enter a number \n");
scanf("%d", &n);

#include <stdio.h>

int main() {
int n,i,j,k;
printf("enter a number \n");
scanf("%d", &n);
printf("Prime numbers are: \n");

for (i=2; i<=n; i++)
{
k=0;
for (j=2; j<i; j++)
{
if (i%j==0)
{
k=1;
}
}
if (k==0)
{
printf("%d\n", i);
}
}

}

Answer 2

https://code.sololearn.com/c0J6l0SEvIVL/?ref=app
Scanf is not meant for writing

Answer 3

Baptiste E. Prunier Never thought use of scanf in a little different way can disturb the output so interestingly. Thank ypu