Here is an example using while loop.
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#include <cs50.h>
#include <stdio.h>
int main(void)
{
// variable declaration
int count, counter;
// reading input from keyboard
count = get_int("Upto how many numbers you want to print? ");
counter = 1;
while (counter <= count)
{
printf("%i ", counter);
counter = counter + 1;
}
printf("\n");
}