#include <stdio.h>

int main() {
 int c;
 while((c = getchar() != EOF)) {
  printf("%dn", c);
 }
 printf("%d - at EOFn", c);
}

while((c = getchar()) != EOF)

while (c = (getchar()!= EOF))

while((c = getchar())!= EOF)

while((c = getchar() != EOF))

#include <stdio.h>
int main()
{
 int c;
 while((c = getchar())!= EOF)
 {
  if( getchar() == EOF )
    break;
  printf(" %dn", c);
 }
  printf("%d %u %x- at EOFn", c , c, c);
}

getchar()

getchar()

#include <stdio.h>

int main() {
    int c;
    while((c = getchar()) != EOF) { //precedence of != is greater than =, so use braces
        printf("%dn", c);
    }
    printf("%d - at EOFn", c);
}

#include <stdio.h>

int main() {
    int c;
    while((c = getchar()) != EOF) {
        putchar(c);
    }
    printf("%d  at EOFn", c);
}

int c;

while((c = getchar())!= 10)
{
    if( getchar() == EOF )
        break;

     printf(" %dn", c);
}