sumif not blank

[sasprogramming]

I am currently trying to create a new variable in my data set called called 'points'. The variable 'points' is the sum of multiple variables. My current code is working fine to sum the data, however I have a problem: I only want to sum the data when all the variables are not blank.

Score = sum(300, 
			A,
                        B,
			C,
			D);

How can I modify my code so that I only sum the data when A, B, C & D are not blank.

Thanks!

[ballardw · Accepted solution]

if nmiss(  A, B, C, D) = 0 then Score = sum(300, A, B,C,	D);

alternatively

Score = 300 + a +b +c +d;

will return missing if any of a, b, c or d are missing.