0_0_9422784_23139.cpp: In function `int main()':
0_0_9422784_23139.cpp:4: error: `o' undeclared (first use this function)
0_0_9422784_23139.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9422784_23139.cpp:8: error: `sum' undeclared (first use this function)
0_0_9422784_23139.cpp:12: error: expected `;' before '}' token
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