View Compilation Error

0_0_12834877_2053.cpp:1: error: `p' was not declared in this scope
0_0_12834877_2053.cpp:1: error: `q' was not declared in this scope
0_0_12834877_2053.cpp:1: error: initializer expression list treated as compound expression
0_0_12834877_2053.cpp:1: error: expected `,' or `;' before '{' token
0_0_12834877_2053.cpp: In function `int main()':
0_0_12834877_2053.cpp:8: error: `scanf' undeclared (first use this function)
0_0_12834877_2053.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12834877_2053.cpp:13: error: `gcd' cannot be used as a function
0_0_12834877_2053.cpp:15: error: `sprintf' undeclared (first use this function)
0_0_12834877_2053.cpp:20: error: `printf' undeclared (first use this function)
0_0_12834877_2053.cpp:22: error: `puts' undeclared (first use this function)