C语言的两道一道改错一道填空

c+1
i+1
c
改错：
scanf("%s",str);
count=count+1

1、填空题
#include <stdio.h>
void main()
{
  int i,c;
  c=0;
  i=1;
  while(i<2021)
  {
    if(i%8==0 || i%10 == 8 || i/10%10 == 8 || i/100%10 == 8)
        c = c+1;
    i=i+1;
  }
  printf("c=%d\n",c);
}


2、改错题：
#include <stdio.h>
void main()
{
  char str[100];
  int i,count;
  printf("Input a string:\n");
  scanf("%s",str);
  count = 0;
  i = 0;
  while(str[i] != '\0')
  {
    if(str[i] >= '0' && str[i] <= '9')
      count += 1;
    i++;
  }
  printf("%d\n",count);
}