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  1. ///call by value : call by reference///
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. void swp(int *x,int *y);
  5. int area(int l,int b);
  6. /*void fun1(int a) //Function Definition//Formal Argument
  7. {
  8.  
  9. }
  10. void fun2(int *p) //Function Definition//Formal Argument
  11. {
  12.  
  13. }*/
  14. int main()
  15. {
  16.     //int x=5;
  17.     //fun1(x); //Function Call//Actual Argument//Call by Value
  18.     //fun2(&x);//Function Call//Actual Argument//Call by Reference(address)
  19.     int l=5,h=10;
  20.     cout<<"using call by value the area      =";
  21.     cout<<area(l,h)<<endl; ///CALL BY VALUE
  22.     int a=2,b=3;
  23.     cout<<"using call by reference after swap=";
  24.     swp(&a,&b);            ///Call by Reference
  25.     cout<<a<<" "<<b<<endl;
  26. }
  27. int area(int l,int b)
  28. {
  29.     return(l*b);
  30. }
  31. void swp(int *x,int *y)
  32. {
  33.     int t,ans;
  34.      t=*x;
  35.     *x=*y;
  36.     *y=t;
  37. }
  38.  
Success #stdin #stdout 0s 4368KB
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Standard input is empty
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using call by value the area      =50
using call by reference after swap=3 2
https://ideone.com/17oQZV
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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