View Compilation Error

24549_0_27877.cpp:5: error: `main' must return `int'
24549_0_27877.cpp: In function `int main(...)':
24549_0_27877.cpp:7: error: `cin' undeclared (first use this function)
24549_0_27877.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
24549_0_27877.cpp:7: error: `n' undeclared (first use this function)
24549_0_27877.cpp:11: error: `cout' undeclared (first use this function)
24549_0_27877.cpp:15: error: `returu' undeclared (first use this function)
24549_0_27877.cpp:15: error: expected `;' before "OK"
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