View Compilation Error

1024467_0_0_26177.cpp:2: error: `main' must return `int'
1024467_0_0_26177.cpp: In function `int main(...)':
1024467_0_0_26177.cpp:3: error: `scanf' undeclared (first use this function)
1024467_0_0_26177.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
1024467_0_0_26177.cpp:3: error: `EOF' undeclared (first use this function)
1024467_0_0_26177.cpp:7: error: `getchar' undeclared (first use this function)
1024467_0_0_26177.cpp:21: error: `printf' undeclared (first use this function)