# HOW DO I DO THAT IN MATLAB SERIES?

## TOPIC

How do I check if a number is non-negative or negative

## SUMMARY

Language : Matlab 2010a; Authors : Autar Kaw and Sri Harsha Garapati; Mfile available at Last Revised : January 23, 2012; Abstract: This program shows you how to check if a number is negative or non-negative using if-else-end statement in MATLAB

```clc
clear all
```

## INTRODUCTION

```disp('ABSTRACT')
disp('   This program shows you how to check if a number is negative or')
disp('   non-negative using if-else-end statement in MATLAB')
disp(' ')
disp('AUTHOR')
disp('   Autar Kaw and Sri Harsha Garapati of http://autarkaw.wordpress.com')
disp(' ')
disp('MFILE SOURCE')
disp('   http://numericalmethods.eng.usf.edu/blog/if_else_end_statements_blog.m')
disp(' ')
disp('LAST REVISED')
disp('   February 13, 2012')
disp(' ')
```
```ABSTRACT
This program shows you how to check if a number is negative or
non-negative using if-else-end statement in MATLAB

AUTHOR
Autar Kaw and Sri Harsha Garapati of http://autarkaw.wordpress.com

MFILE SOURCE
http://numericalmethods.eng.usf.edu/blog/if_else_end_statements_blog.m

LAST REVISED
February 13, 2012

```

## INPUTS

```% Enter the number to be tested
a=4;
```

## DISPLAYING INPUTS

```disp('  ')
disp('INPUTS')

% Printing the input number
fprintf('The input number to be tested is %g\n',a)
```
```
INPUTS
The input number to be tested is 4
```

## CODE AND DISPLAYING OUTPUT

```disp('  ')
disp('OUTPUTS')

% using the if-else-end statement to check
if (a>=0)
disp('The number is nonnegative')
else
disp('The number is negative')
end
```
```
OUTPUTS
The number is nonnegative
```