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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. template <typename T>
  5.  
  6. T foo(T &a, T &b)
  7. {
  8. 	T c;
  9. 	c = a;
  10. 	a = b;
  11. 	b = c;
  12. }
  13.  
  14. int main() {
  15.  
  16. 	T a, b;
  17.  
  18. 	cout << "Vvedite znachenie a:" << endl;
  19. 	cin >> a;
  20. 	cout << "Vvedite znachenie b" << endl;
  21. 	cin >> b;
  22.  
  23. 	foo(a, b);
  24.  
  25. 	cout << "a= " << a << endl;
  26. 	cout << "b= " << b << endl;
  27.  
  28. 	return 0;
  29. }
Compilation error #stdin compilation error #stdout 0s 16064KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:16:2: error: ‘T’ was not declared in this scope
  T a, b;
  ^
prog.cpp:19:9: error: ‘a’ was not declared in this scope
  cin >> a;
         ^
prog.cpp:21:9: error: ‘b’ was not declared in this scope
  cin >> b;
         ^
stdout
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Standard output is empty
https://ideone.com/aHRiCI
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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