trying to change frequency of pwm arduino uno

i want to connect arduino uno to matlab so i write s-function in matlab simulink file. i am trying to change frequency of pwm of arduino uno so i wrote this line in s-function but i got error

this is the code

TCCR2B = TCCR2B & B11111000 | B00000001; // for PWM frequency of 31372.55 Hz

the error message is
[code]G:/MA1AE7~1/freq31khz_wrapper.c:46:19: error: 'B11111000' undeclared (first use in this function)
 TCCR2B = TCCR2B & B11111000 | B00000001; // for PWM frequency of 31372.55 Hz
                   ^
G:/MA1AE7~1/freq31khz_wrapper.c:46:31: error: 'B00000001' undeclared (first use in this function)
 TCCR2B = TCCR2B & B11111000 | B00000001; // for PWM frequency of 31372.55 Hz
                               ^
gmake: *** [freq31khz_wrapper.o] Error 1
### Build procedure for model: 'arduinoled' aborted due to an error.
Error(s) encountered while building "arduinoled":
### Failed to generate all binary outputs

[msh jgtu]

any help

[saber souid]

can you send it to me to see the problem

[e-mail]