help for the program for water tank

thanks for giving me the kick start idea
but i am getting this error in Line #13 and #22
( I am using Code::Blocks 10.05 )

\4-16v1.c||In function `main':expressionless:
\4-16v1.c|13|error: syntax error before "void"|
\4-16v1.c|22|error: syntax error before '{' token|
** ||=== Build finished: 2 errors, 0 warnings ===|**

the code's are as
I know its still wrong but please help
thanks

#include<stdio.h>
#include<conio.h>
void display(int z);
int main(void)
{
     int a,b,c,d;
     int x[16] = {0,10,20,25,30,40,50,60,70,75,80,90,100,100,100,100}

     //printf("Enter the Val of A,B,C,D\n");
     //scanf("%d,%d,%d,%d",&a,&b,&c,&d);
     //printf("Val of a,b,c,d,%d,%d,%d,%d",a,b,c,d);

void display(int z);
{
  int index = a*8 + b*4 + c*2 + d;
   printf("%d, %d, %d, %d is %d %%", a, b, c, d, x[index]);
}
     getch();
     }


{

    void display(int z)

{
    if(a==0 && b==0 && c==0 && d==0)
    printf("%d,%d,%d,%d is %d%% EMPTY",a,b,c,d,x[0]);//0000=00
    }
{
    if(a==0&&b==0&&c==0&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[1]);//0001=01
    }
{
    if(a==0&&b==0&&c==1&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[2]);//0010=02
    }
{
    if(a==0&&b==0&&c==1&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[3]);//0011=03
    }
{
    if(a==0&&b==1&&c==0&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[4]);//0100=04
    }
{
    if(a==0&&b==1&&c==0&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[5]);//0101=05
    }
{
    if(a==0&&b==1&&c==1&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[6]);//0110=06
    }
{
    if(a==0&&b==1&&c==1&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[7]);//0111=07
    }
{
    if(a==1&&b==0&&c==0&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[8]);//1000=08
    }
{
    if(a==1&&b==0&&c==0&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[9]);//1001=09
    }
{
    if(a==1&&b==0&&c==1&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[10]);//1010=10
    }
{
    if(a==1&&b==0&&c==1&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[10]);//1011=11
    }
{
    if(a==1&&b==1&&c==0&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[12]);//1100=12
    }
{
    if(a==1&&b==1&&c==0&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[13]);//1101=13
    }
{
    if(a==1&&b==1&&c==1&&d==0)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[14]);//1110=14
    }
{
    else(a==1&&b==1&&c==1&&d==1)
    printf("%d, %d, %d, %d is %d %%", a,b,c,d, x[15]);//1111=15
    }

}