View Compilation Error

0_0_23741093_19162.cpp:1:10: error: #include expects "FILENAME" or <FILENAME>
 #include 
          ^
0_0_23741093_19162.cpp: In function 'int main()':
0_0_23741093_19162.cpp:9:26: error: 'scanf' was not declared in this scope
  while(scanf("%d%d",&n,&m)!=EOF)
                          ^
0_0_23741093_19162.cpp:9:29: error: 'EOF' was not declared in this scope
  while(scanf("%d%d",&n,&m)!=EOF)
                             ^
0_0_23741093_19162.cpp:24:23: error: 'printf' was not declared in this scope
    if(i!=0) printf(" "); //输出每个人的平均成绩，注意输出格式
                       ^
0_0_23741093_19162.cpp:25:23: error: 'printf' was not declared in this scope
    printf("%.2lf",avg1);
                       ^
0_0_23741093_19162.cpp:28:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^