sample c programs

Find first bit in word - ffb.c

# ./ffb
first bit(0xDEADBEAF): 0
first bit(0xDEADBEA0): 5
first bit(0xDEADBE00): 9
first bit(0xDEADB000): 12
first bit(0xDEAD0000): 16

create a daemon and redirect output to logfile - pcreate.c

cat > daemon.sh << EOF
#!/bin/sh
while [ 1 ]; do date; sleep 1; done
EOF

# chmod +x daemon.sh
# gcc -o pcreate pcreate.c
# ./pcreate ./daemon.sh logfile.log
# tail -f logfile.log

program to print U-Boot environment variables - ubootenv.c
hexdump of U-Boot env partition - uboot.env

# gcc -o ubootenv ubootenv.c 
# ./ubootenv uboot.env
CRC32: 0xE2A77069
Active Flag: 0x01

bootdelay=0
baudrate=115200
download_baudrate=115200
....

Euclid's Algorithm to find GCD (gcd.c)

# gcc -o gcd gcd.c
# ./gcd 12345 56789
  gcd of 12345 and 56789 is 1

sieve of Eratosthenes to find prime numbers (prime.c)

# gcc -o prime prime.c
# ./prime 100
    2    3    5    7   11   13   17   19   23   29
   31   37   41   43   47   53   59   61   67   71
   73   79   83   89   97
Tottal number: 25

Simple client/Server communication (server1.c, client1.c)
Simple client/Server communication (server2.c, client2.c)
Simple client/Server communication (server3.c, client3.c)



# gcc -o server serverX.c
# gcc -o client clientX.c

# ./server 5555
Here is the message: hello server

# ./client localhost 5555
Please enter the message: hello server
from server time: Tue Nov 23 05:06:08 2010

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