View Compilation Error

0_0_26961740_30672.cpp: In function 'int main()':
0_0_26961740_30672.cpp:14:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&m,&n)!=EOF){
                             ^
0_0_26961740_30672.cpp:14:32: error: 'EOF' was not declared in this scope
     while(scanf("%d%d",&m,&n)!=EOF){
                                ^
0_0_26961740_30672.cpp:17:26: error: 'printf' was not declared in this scope
         printf("%d\n",res);
                          ^