View Compilation Error

0_0_18988181_32719.cpp: In function 'int main()':
0_0_18988181_32719.cpp:18:30: error: 'scanf' was not declared in this scope
     while(scanf("%d %d",&M,&N)!=EOF){  
                              ^
0_0_18988181_32719.cpp:18:33: error: 'EOF' was not declared in this scope
     while(scanf("%d %d",&M,&N)!=EOF){  
                                 ^
0_0_18988181_32719.cpp:27:39: error: 'printf' was not declared in this scope
             printf("%.3f\n",totalMount);  
                                       ^
0_0_18988181_32719.cpp:36:39: error: 'printf' was not declared in this scope
             printf("%.3f\n",totalMount);  
                                       ^
0_0_18988181_32719.cpp:56:35: error: 'printf' was not declared in this scope
         printf("%.3f\n",totalMount);  
                                   ^