Can we clear array?

if have data in sd card like:

1234a
5678a
9012a

and wanna like:

int number[4],sol[4]
while (myfile.available())
   {
     int data = myfile.read();
     sol=data;
     number=sol-'0';
     i=i+1;
     delay(1);
     if(sol[4]=='a')
     {
       serial.println(((number[0]*1000)+(number[1]*100)+(number[2]*10)+number[3]),dec);
     }
   }
then clear sol[4]for record next number
can it?
if can how to?

code: [select]

sol=data;

that's error.  sol needs index tell 1 of slots in array want put number in. 

code: [select]

sol[3] = 0;

would set fourth element in zero. 


also note:

there no sol[4].  created sol 4 elements, numbered 0 through 3.  there no 4.  error.  still compile, comparing garbage memory outside of array. 

code: [select]

if(sol[4]=='a')

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