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Friday, November 8

Best Explanation of Functions by Usman Sherry

00:05 By , , , 3 comments

Some basic understanding to use functions:




          First of all we have to look for output of functions as we want




    

  • void
    • 

  • int
    • 

  • double
    • 

      

    • and so for other types. The major difference is between void and non-void (integral, character and float) outputs.
      • 

    




Void: (with no arguments)







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  1. #include<iostream>
    2. 

  2. using namespace std;
    3. 

  3. void function();                                 //with or without arguments dose not effect it's output type
    4. 

  4. void main()
    5. 

  5. {
    6. 

  6.           function();
    7. 

  7. } 
    8. 

  8. void function()
    9. 

  9. {
    10. 

  10.            cout<<"To display something "<<endl;
    11. 

  11. }                                                         // void type returns no value with or without argument
    12. 






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Output will be:



To display something                                                                               Press any key to continue . . .                                                                   



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Void: (with arguments)



------------------------------------------------------------------------------------------------------------




    

  1. #include<iostream>
    2. 

  2. using namespace std;
    3. 

  3. void function(int);                 //with or without arguments dose not effect it's output type
    4. 

  4. void main()
    5. 

  5. {
    6. 

  6.           int y;
    7. 

  7.           cin>>y;
    8. 

  8.           function(y);
    9. 

  9. } 
    10. 

  10. void function(int y)
    11. 

  11. {
    12. 

  12.            cout<<"Square is :"<<y*y<<endl;
    13. 

  13. }                                                // void type returns no value with or without argument
    14. 






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Output will be: (let y=5)





Square is :25                                                                                           Press any key to continue . . .                                                                   









_________________________________________________________________



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Other types of outputs:



without argument



------------------------------------------------------------------------------------------------------------






    

  1. #include<iostream>
    2. 

  2. using namespace std;
    3. 

  3. int function();         //with or without arguments dose not matter it's output type
    4. 

  4. void main()
    5. 

  5. {
    6. 

  6.        cout<<function()<<endl;
    7. 

  7. } 
    8. 

  8. int function()
    9. 

  9. {
    10. 

  10.     return 5*99;
    11. 

  11. }                       // must return a value 
    12. 










------------------------------------------------------------------------------------------------------------





Output will be:





495                                                                                                       Press any key to continue . . .                                                                   











------------------------------------------------------------------------------------------------------------



with argument





------------------------------------------------------------------------------------------------------------






    

  1. #include<iostream>
    2. 

  2. using namespace std;
    3. 

  3. int function(int,int);    //with or without arguments dose not matter it's output type
    4. 

  4. void main()
    5. 

  5. {
    6. 

  6.        int x,y;
    7. 

  7.        cin>>x>>y;
    8. 

  8.        cout<<function(x,y)<<endl;
    9. 

  9. } 
    10. 

  10. int function(int x,int y)
    11. 

  11. {
    12. 

  12.     return y*x;
    13. 

  13. }                         // must return a value 
    14. 










------------------------------------------------------------------------------------------------------------





Output will be: (x=5 / y=3)



5                                                                                                           



3                                                                                                           



15                                                                                                         Press any key to continue . . .                                                                   









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