View Compilation Error

300302_0_18762.cpp: In function `int main()':
300302_0_18762.cpp:6: error: `int_64' undeclared (first use this function)
300302_0_18762.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
300302_0_18762.cpp:6: error: expected `;' before "a"
300302_0_18762.cpp:7: error: `t' undeclared (first use this function)
300302_0_18762.cpp:10: error: `a' undeclared (first use this function)
300302_0_18762.cpp:10: error: `b' undeclared (first use this function)
300302_0_18762.cpp:11: error: `i' undeclared (first use this function)
300302_0_18762.cpp:13: error: `sum' undeclared (first use this function)