ADC_CHO not compiling in Kevin's code

[Hazmatt]

We're trying to compile with Kevin's code using an analog input and printing it to the screen but when we tried to compile we got a code error saying that "symbol 'ADC_CH0' has not been defined"

arm_pos = Get_Analog_Value(ADC_CH0);
printf ("arm position = %d\r\n",arm_pos);