how to display output in Matlab gui?

prompt{1}='Enter 1st grade :';
prompt{2}='Enter 2nd grade :'; 
name='result';
answer=inputdlg(prompt,name);
a=xlsread('inputdata.xlsx');

excel file values are

0.1  0.1  0.1
0.1  0.2  0.1
0.1  0.3  0.1
0.1  0.4  0.2
0.1  0.5  0.2
0.1  0.6  0.2
0.1  0.7  0.3
0.1  0.8  0.3
0.2  0.1  0.1
0.2  0.2  0.2
0.2  0.3  0.2
0.2  0.4  0.2
0.2  0.5  0.3
0.2  0.6  0.3
0.2  0.7  0.3
0.2  0.8  0.4
0.3  0.1  0.1
0.3  0.2  0.2
0.3  0.3  0.2

1st grade values are in 1st column

2nd grade values are in 2nd column

if user enter values for 1st and 2nd grade, then it has to display the output. output is the corresponding 3rd column value.

for eg:

Enter 1st grade : 0.2

Enter 2nd grade :0.8

output is 0.4

please give me a solution

Answer 1

[Image Analyst]

You'll need to understand this entry in the FAQ before you complete your homework exercise: http://matlab.wikia.com/wiki/FAQ?&cb=7634#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

Another hint, to display a value

message = sprintf('The value is %.2f', someValue);
uiwait(msgbox(message));