How to add a label to a general line

clear all;
close all;
clc;

r = 0:.1:14; % (valume of compration ratio)

b = input ( 'input number of specific heat ratio (k) ');

for i=1:b
    
    if i <=b
        
      k = input ( 'impot volume of specific heat ratio1    :   '); 
       
      f = 1 - ( 1./ r.^(k-1));
      
      figure(1);

      title 'comparison';
      
      ylabel('efficiency')

      plot (r,f)
      
      ax = gca;

      ax.FontSize = 13;
      
      hold on ;
      
      legend('otto')
      
      ylim([0 1])

      i = i+1;
 
      figure(2)
      
      title 'otto cycle';

      xlabel('r') 

      ylabel('   ?    ')
         
      plot(r,f) 
      
      hold on;
      
      ylim([0 1])
      
    end
end


r = 0:.1:26; % (valume of compration ratio)

v = input ( 'input number of cut off   :  ');

for i=1:v
    
    if i <=v
        
      rc = input ( 'impot volume of cut off   :   ');
       
      k = 1.4;
     
      f1 = 1 - (( 1 ./ (r.^(k-1))) * (((rc.^k)-1) / (k.*(rc-1))));
      
      figure(1);
      
      title 'comparison';
      
      ylabel('efficiency')
 
      plot (r,f1,'--')
     
      ax = gca;

      ax.FontSize = 13;
          
      hold on ;
      
      legend('Otto','Diesel')
      
      ylim([0 1])

      i = i+1;

      figure(3)
      
      xlabel('r') 

      ylabel('   ?    ')
 
      title 'Diesel cycle';

      plot(r,f1);
 
      ylim([0 1])

      hold on

    end
end


r = 0:.1:30; % (valume of compration ratio)

 l= input ( 'input number of specific heat ratio (k) ');
 
for i=1:l
    
    if i <=l
        
     k = input ( 'impot volume of specific heat ratio    :   ');
    
      f2 = 1 - (1./r.^((k-1)./k)) ;
      
      figure(1);
      
      title 'comparison';
      
      ylabel('efficiency')

      plot (r,f2,'b--o')
       
      ax = gca;

      ax.FontSize = 13;
      
      hold on ;
      
     legend('Otto','Diesel','Brayton')
     
      ylim([0 1])
      
      i = i+1;
 
      figure(4)
 
      title ' Brayton cycle ';

      plot(r,f2);
 
      ylim([0 1])

      hold on

    end
end

I designed 3 cycles Brighton, Diesel, Otto

And l used 3 loops in order of names and 4 shapes were drawn.

Comparison

Brighton cycle

Diesel cycle

Otto cycle

And I don't know how I can show the amount of( K) taken from the user in the cycle Otto

(rc) in the diesel cycle and( k) in the shape of Brighton.

Answer 1

[madhan ravi]

Use sprintf(...)

Answer 2

[alireza rahimi]

what exacly use for ? it dose for leble or not :(