How do I stop a code from continuing ifelse statements?

I'm creating a script that converts phasor to complex numbers and then back again once I'm done converting. However if I only have one phasor to convert the script runs until the very end. How do I end the whole script if it satisfies what the user wants to do with it. For instance, if a==1 I want it to do the conversion then finish.

Mag1=input('What is the magnitude in the frequency domain? ');
Angle1=input('What is the angle in the frequency domain? ');
x=Mag1*cosd(Angle1)+Mag1*sind(Angle1)*1i
mag=abs(x);
rad=angle(x);
%z=complex(x) 
disp('Enter 1 for yes, 0 for no')
a=input('Are you done converting from phasor to complex?' );
if a==1
    mag=abs(x)
rad=angle(x);
deg=rad*180/pi
elseif a==0
    Mag2=input('What is the second magnitude?' )
    Angle2=input('What is the second angle? ' )
    x1=Mag2*cosd(Angle2)+Mag2*sind(Angle2)*1i
mag=abs(x1);
rad=angle(x1);
%z=complex(x)
end
b=input('Are you done coverting now? ');
if b==1 
    c=input('Would you like to add the two complex numbers together? ' );
    if c==1
        z=x+x1
    elseif c==0
        z=x

Thank you for any suggestions you may have.

Answer 1

[Jon]

http://www.mathworks.com/help/techdoc/ref/return.html

http://www.mathworks.com/help/techdoc/ref/break.html

Take your pick.

[Andrew Winkle]

Thank you, I must have been using it in the wrong line. I appreciate your quick response.

[Jon]

Or your if condition wasn't being met. In an if statement, these two perform the same, but they behave differently in loops.