I've been working on my greedy with modulo for a while now and I'm not sure what I'm doing wrong.(For the moment I'm focusing on the part where I use integers to count the number of coins, skipping the part where I need to get the correct input in form of float etc.) But the compiler continues giving me the error "greedy.c:16:13: error: declaration shadows a local variable [-Werror,-Wshadow] int nc1 = s / 25;" What am I doing wrong? (I've included all libraries)

int main(void) { int s = get_int();

int nc1;
int nc2;
int nc3;
int nc4;

if ( s >= 25 )
{
    int nc1 = s / 25;
    int r = s % 25;
    s = r;
}

if (s >= 10)
  {
    int nc2 = s / 10;
    int r = s % 10;
     s = r;
  }

if (s >=5)
  {
    int nc3 = s / 5;
    int r = s % 5;
    s = r;
  }

else (s >= 1)
  {
    int nc4 = s;
  }

int nc = nc1 + nc2 + nc3 + s;

}

I've been working on my greedy with modulo for a while now and I'm not sure what I'm doing wrong.(For the moment I'm focusing on the part where I use integers to count the number of coins, skipping the part where I need to get the correct input in form of float etc.) But the compiler continues giving me the error "greedy.c:16:13: error: declaration shadows a local variable [-Werror,-Wshadow] int nc1 = s / 25;" What am I doing wrong? (I've included all libraries)

int main(void)
{
    int s = get_int();

    int nc1;
    int nc2;
    int nc3;
    int nc4;

    if ( s >= 25 )
    {
        int nc1 = s / 25;
        int r = s % 25;
        s = r;
    }

    if (s >= 10)
      {
        int nc2 = s / 10;
        int r = s % 10;
         s = r;
      }

    if (s >=5)
      {
        int nc3 = s / 5;
        int r = s % 5;
        s = r;
      }

    else (s >= 1)
      {
        int nc4 = s;
      }

    int nc = nc1 + nc2 + nc3 + s;
}