Maybe I did incorrect output?

#include <stdio.h>

int a[100][100]={{2,3,4,4,4,4,3,2},
             {3,4,6,6,6,6,4,3},
             {4,6,8,8,8,8,6,4},
              {4,6,8,8,8,8,6,4},
              {4,6,8,8,8,8,6,4},
              {4,6,8,8,8,8,6,4},
             {3,4,6,6,6,6,4,3},
             {2,3,4,4,4,4,3,2}};

int b[102];
int trans(char c1);
int i=0,n,y,x,j;
    char c;

int main()
{

    scanf("%d",&n);
    for(i=0;i<n;i++)
    {
        b[i]=0;
        fflush( stdin );
        scanf("%c",&c);
        x=trans(c)-1;
        scanf("%c",&c);
        y=trans(c)-1;
        fflush( stdin );
        b[i]=a[x][y];
    }
    for(i=0;i<n;i++)
        printf("%d\n",b[i]);
    return 0;
}

int trans(char c1)
{
    int x1;
    switch(c)
    {
        case 'a': x=1; break;
        case 'b': x=2; break;
        case 'c': x=3; break;
        case 'd': x=4; break;
        case 'e': x=5; break;
        case 'f': x=6; break;
        case 'g': x=7; break;
        case 'h': x=8; break;
        case '1': x=1; break;
        case '2': x=2; break;
        case '3': x=3; break;
        case '4': x=4; break;
        case '5': x=5; break;
        case '6': x=6; break;
        case '7': x=7; break;
        case '8': x=8; break;
    }
    return x1;
}

just write x1 instead of x in subroutine trans

int trans(char c1)
{
int x1;//<--!!!
switch(c)
{
case 'a': x=1; break;//!
case 'b': x=2; break;//!
case 'c': x=3; break;//!
//...
case '8': x=8; break;//!
}
return x1;//<--!!!
}

OMG! Isn`t there Visual Studio compiler? I'll know this feature at future, thanks.

dx[8]={1,2,2,1,-1,-2,-2,-1},dy[8]={2,1,-1,-2,-2,-1,1,2};

......
cin>>in;

    for(i=0;i<8;i++)
    {
        if(aa[i]==in[0])
        {a=i;}

    }
   for(i=0;i<8;i++)
    {
    if(bb[i]==in[1])
       {b=i;}

    }
.....