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  1. #include <iostream>
  2. using namespace std;
  3.  fn1(int Arg){
  4.         int a = 10;
  5.  }
  6.  int main(){
  7.     cout << "fn1(): " << fn1(22) << endl;
  8.     return 0;
  9. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp:3:13: error: ISO C++ forbids declaration of ‘fn1’ with no type [-fpermissive]
  fn1(int Arg){
             ^
stdout
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Standard output is empty
https://ideone.com/xUqSTH
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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