View Compilation Error

0_0_16382881_6923.cpp: In function 'int main()':
0_0_16382881_6923.cpp:5:29: error: 'scanf' was not declared in this scope
     while(scanf("%d%d",&n,&m)!=EOF){  
                             ^
0_0_16382881_6923.cpp:5:32: error: 'EOF' was not declared in this scope
     while(scanf("%d%d",&n,&m)!=EOF){  
                                ^
0_0_16382881_6923.cpp:19:57: error: 'printf' was not declared in this scope
                  printf(k==n-1?"%.2f\n":"%.2f ",aver1[k]);  
                                                         ^
0_0_16382881_6923.cpp:23:57: error: 'printf' was not declared in this scope
                  printf(t==m-1?"%.2f\n":"%.2f ",aver2[t]);  
                                                         ^
0_0_16382881_6923.cpp:37:34: error: 'printf' was not declared in this scope
             printf("%d\n\n",count);  
                                  ^