PicC 9.50 dsPIC Manual.pdf

Error and Warning Messages(761) sizeof yields 0 (Code Generator)The code generator has taken the size of an object and found it to be zero. This almost certainlyindicates an error in your declaration of a pointer, e.g. you may have declared a pointer to a zerolength array. In general, pointers to arrays are of little use. If you require a pointer to an array ofobjects of unknown length, you only need a pointer to a single object that can then be indexed orincremented.(763) constant left operand to ? (Code Generator)The left operand to a conditional operator ? is constant, thus the result of the tertiary operator ?:will always be the same, e.g.:a = 8 ? b : c; /* this is the same as saying a = b; */(764) mismatched comparison (Code Generator)A comparison is being made between a variable or expression and a constant value which is not inthe range of possible values for that expression, e.g.:unsigned char c;if(c > 300) /* woops -- how can this be true? */close();(765) degenerate unsigned comparison (Code Generator)There is a comparison of an unsigned value with zero, which will always be true or false, e.g.:unsigned char c;if(c >= 0)will always be true, because an unsigned value can never be less than zero.(766) degenerate signed comparison (Code Generator)There is a comparison of a signed value with the most negative value possible for this type, suchthat the comparison will always be true or false, e.g.:char c;if(c >= -128)will always be true, because an 8 bit signed char has a maximum negative value of -128.309