i was writing a character whose ASCII value is 144 to a file transfer.txt, then i close the file and open it to read the character which i wrote and when i checked the ascii value of it it was showing -112…..why????

#include<stdio.h>
#include<fcntl.h>
#include<stdlib.h>

void main()
{
char ch=144,str;
int fd;
fd=open(“transfer.txt”,O_WRONLY|O_CREAT|O_TRUNC);
if(fd<0)
{
perror(“fault\n”);
exit(1);
}
write(fd,&ch,1);
close(fd);
fd=open(“transfer.txt”,O_RDONLY);
read(fd,&str,1);
printf(“%d\n”,str);
close(fd);
}

text       data        bss        dec        hex    filename
1149        492         16       1657        679    hello
what does it mean? plz reply….