o: Used for unsigned int expected's value. : scanf unsigned « printf scanf « C Tutorial

1. C Tutorial
2. printf scanf
3. scanf unsigned

It should be an integer in octal form.

#include <stdio.h>

main()
{
    int i = 0;
    int k;
    printf("an integer:");
    i=scanf("%o",&k);
    printf("total values inputted %d\n",i);
    printf("The input values %o\n",k);
}

an integer:2
      total values inputted 1
      The input values 2