Why is my code displaying two messages instead of one?

if BirthM == 1
        fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
    elseif BirthM ~= 1
        fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
    end
    if BirthD == 1
        fprintf (fileID,'\n you are %d years %d months and %d day old', BirthY,BirthM,BirthD);
    elseif BirthD ~= 1
        fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
    end

I'm not sure why but but displays two messages even when the conditions for the one of the if statements aren't met.

Answer 1

[Walter Roberson]

Reformat your code:

if BirthM == 1
    fprintf (fileID,'\n you are %d years %d month and %d days old', BirthY,BirthM,BirthD);
elseif BirthM ~= 1
    fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
end
if BirthD == 1
    fprintf (fileID,'\n you are %d years %d months and %d day old', BirthY,BirthM,BirthD);
elseif BirthD ~= 1
    fprintf (fileID,'\n you are %d years %d months and %d days old', BirthY,BirthM,BirthD);
end

Your conditions are not nested.

If you look at your if elseif sequence then the only times it will not output a string are the cases:

• BirthM is nan
• BirthM is vector (or matrix) including some 1 and some values that are not 1.