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  1.     #include <iostream>
  2.  
  3.     int i = 20;
  4.  
  5.     int main() {
  6.         int i = 10;
  7.         int i = 20; // only possible if your compiler/compiler-mode is "stupid".
  8.         for (int i = 0; i < 5; ++i) {
  9.             std::cout << "loop i = " << i << std::endl;
  10.         }
  11.         std::cout << "i = " << i << std::endl;
  12.     }
  13.  
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: In function ‘int main()’:
prog.cpp:7:13: error: redeclaration of ‘int i’
         int i = 20; // only possible if your compiler/compiler-mode is "stupid".
             ^
prog.cpp:6:13: error: ‘int i’ previously declared here
         int i = 10;
             ^
stdout
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Standard output is empty
https://ideone.com/eJ3olP
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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