View Compilation Error

0_0_1180217_28424.cpp:3: error: expected `;' before '?' token
0_0_1180217_28424.cpp:3: error: expected unqualified-id before '?' token
0_0_1180217_28424.cpp:3: error: expected `,' or `;' before '?' token
0_0_1180217_28424.cpp: In function `void joint(int, int)':
0_0_1180217_28424.cpp:7: error: `set' undeclared (first use this function)
0_0_1180217_28424.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1180217_28424.cpp: In function `int main(int, char**)':
0_0_1180217_28424.cpp:21: error: `set' undeclared (first use this function)