Programming and Graphics

F.4Elementary examples 351

• for loop:

>> for j=-1:1

j

end

j=

-1

j=

0

j=

1

In this example, the first three lines are entered by the user.

• if statement:

>> j=0;

>> i=1;

>> if i==j+1, disp ’case 1’, end

case 1

• for loop:

>> n=3;

>> for i=n:-1:2

disp ’i=’; disp (i), end

i=

3

i=

2

The loop is executed backward, starting atn, with step of -1.

• if loop:

>> i=1; j=2;

>> if i==j+1; disp ’case 1’

elseif i==j; disp ’case2’

else; disp ’case3’

end

case3

In this example, all but the last line are entered by the user.