View Compilation Error

0_0_6234995_30836.cpp: In function `int main()':
0_0_6234995_30836.cpp:9: error: `in' undeclared (first use this function)
0_0_6234995_30836.cpp:9: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6234995_30836.cpp:9: error: expected `;' before "i"
0_0_6234995_30836.cpp:9: error: `i' undeclared (first use this function)