View Compilation Error

147438_0_30000.cpp:3: error: `main' must return `int'
147438_0_30000.cpp: In function `int main(...)':
147438_0_30000.cpp:3: error: conflicting declaration 'int a'
147438_0_30000.cpp:3: error: 'a' has a previous declaration as `int a[41]'
147438_0_30000.cpp:3: error: declaration of `int a'
147438_0_30000.cpp:3: error: conflicts with previous declaration `int a[41]'
147438_0_30000.cpp:6: error: expected `;' before ')' token
147438_0_30000.cpp:8: error: `cin' undeclared (first use this function)
147438_0_30000.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
147438_0_30000.cpp:12: error: `cout' undeclared (first use this function)
147438_0_30000.cpp:12: error: `endl' undeclared (first use this function)