Now I compile it in my computer it works fine and even in the results of the CPTTRN 1 judge thing it shows exactly the same thing in expected result and your result then why does it keep saying wrong answer ?????? what is this I cant figure it out

include

int main(void) {
int t,f;
unsigned int line,col;
int i,j,flag,isEven;
scanf("%d",&t);
for(f=1;f<=t;f++){
scanf("%u",&line);
scanf("%u",&col);

      if(line == col)
    isEven = 1;
else
    isEven = 0;
flag=0;
for(i=0;i<line;i++){
    for(j=0;j<col;j++){
        if(flag == 0){
            printf("*");
            flag = 1;
        }
        else{
            printf(".");
            flag = 0;
        }
    }

    printf("\n");
    if(isEven == 1){
        if(flag == 0)
            flag =1;
        else
            flag =0;
    }

}
printf("\n");
}
return 0;

}

What nooo , It runs perfectly fine please try and run it ...I even get the correct output like I said but for somereason the jude says wrong answer I dont know why