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Welcome to this forum!Which version of Code::Blocks? Which Compiler?Why to use a file named HelloWorld.cpp or Hello_World.cpp.
C:\Program Files\CodeBlocks\Hello world.cpp|1|no include path in which to search for iostream|C:\Program Files\CodeBlocks\Hello world.cpp||In function `int main()':|C:\Program Files\CodeBlocks\Hello world.cpp|5|error: `cout' was not declared in this scope|||=== Build finished: 2 errors, 0 warnings ===|