1)Write a java program to read the characters from a file, if a character is alphabet then reverse its case, if not then display its category on the Screen. (whether it is Digit or Space)
import java.io.*;
class Slip1
{
public static void main(String args[])throws Exception
{
FileInputStream fin=new FileInputStream("a.txt");
int b;
while((b=fin.read())!=-1)
{
if(b>=65&&b<=90)
{
b=b+32;
System.out.print((char)b);
}
else
{
if(b>=97&&b<=122)
{
b=b-32;
System.out.print((char)b);
}
else
{
if(b>=48&&b<=57)
{
System.out.print("DIGIT");
}
if(b==32)
{
System.out.print("SPACE");
}
}
}
}
}
}
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