File reading and writing in verilog

[kommu4946]

Hi All,

I have written a verilog code to interchange 3 X 3 matrix rows and columns.I am just reading a file and writing into another new file and also i want to read first row of resultant matrix .Here is the code

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Code Verilog - [expand]
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module sim3(
    );
integer i,fd1,fd2,n1,n2;
reg [3:0]row1[0:2];
reg [3:0]row2[0:2];
reg [3:0]row3[0:2];
reg [3:0]a[0:2];
initial begin
fd1=$fopen("input_matrix.txt","r");
fd2=$fopen("out_matrix.txt","r+");//open for update (reading and writing) 
n1=$fscanf(fd1,"%d%d%d",row1[0],row1[1],row1[2]);
n1=$fscanf(fd1,"%d%d%d",row2[0],row2[1],row2[2]);
n1=$fscanf(fd1,"%d%d%d",row3[0],row3[1],row3[2]);
for(i=0;i<3;i=i+1) begin
$fwrite(fd2,"%d%d%d\n",row1[i],row2[i],row3[i]);
end
n2=$fscanf(fd2,"%d%d%d",a[0],a[1],a[2]);
$fclose(fd1);
$fclose(fd2);
end
 
endmodule

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The above code is writing into a new file but unable to read into another variable [2:0]a why?
and also can i use same integer variable for fscanf when each time it is used and each time it is returning the same value 3 why?. I studied reference manual they explained file descriptor and mcd for only fopen.PLEASE HELP ME..