View Compilation Error

0_0_15577525_2744.cpp: In function 'void factor(int, int&)':
0_0_15577525_2744.cpp:7:31: error: 'sqrt' was not declared in this scope
     temp=(int) ((double)sqrt(n)+1);
                               ^
0_0_15577525_2744.cpp:8:5: error: 'cout' was not declared in this scope
     cout<<n<<" "<<temp<<endl;
     ^
0_0_15577525_2744.cpp:8:25: error: 'endl' was not declared in this scope
     cout<<n<<" "<<temp<<endl;
                         ^
0_0_15577525_2744.cpp: In function 'int main()':
0_0_15577525_2744.cpp:26:24: error: 'scanf' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                        ^
0_0_15577525_2744.cpp:26:27: error: 'EOF' was not declared in this scope
     while(scanf("%d",&n)!=EOF){
                           ^
0_0_15577525_2744.cpp:28:9: error: 'cout' was not declared in this scope
         cout<<si<<endl;
         ^
0_0_15577525_2744.cpp:28:19: error: 'endl' was not declared in this scope
         cout<<si<<endl;
                   ^