a = 4; % declare variable and initialize double value,
        s = 'abc'; % string
        i8 = int8(5);	% signed byte
        u8 = uint8(5);	% unsigned byte
        i16 = int16(5);	% signed 2 byte
        u16 = uint16(5); % unsigned 2 byte integer
        i32 = int32(5);	% signed 4 byte integer
        u32 = uint32(5);% unsigned 4 byte integers
        i64 = int64(5);	% signed 8 byte integer
        u64 = uint64(5);% unsigned 8 byte integer
	f32 = float32(5); % single precision floating point number
	f64 = float64(5); % double precision floating point number , float 64 is the default data type.

	c = 4+5i; %	complex number
        colvec = [1;2;4];   % column vector
        crowvec = [1,2,4];   % row vector
        m = [1,2,3;4,5,6];  % matrix with size 2x3