0_0_5957037_26598.cpp: In function `int main()':
0_0_5957037_26598.cpp:5: error: `doubler' undeclared (first use this function)
0_0_5957037_26598.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5957037_26598.cpp:6: error: `r' undeclared (first use this function)
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