View Compilation Error

0_0_5586474_11471.cpp: In function `int main()':
0_0_5586474_11471.cpp:4: error: expected primary-expression before "int"
0_0_5586474_11471.cpp:4: error: expected `;' before "int"
0_0_5586474_11471.cpp:6: error: `a' undeclared (first use this function)
0_0_5586474_11471.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5586474_11471.cpp:6: error: `b' undeclared (first use this function)
0_0_5586474_11471.cpp:7: error: `sum' undeclared (first use this function)