View Compilation Error

0_0_31128343_29743.cpp:1:1: error: 'include' does not name a type
 include<stdio.h>  
 ^
0_0_31128343_29743.cpp: In function 'int main()':
0_0_31128343_29743.cpp:8:37: error: 'scanf' was not declared in this scope
  while( scanf("%d%d%d%d",&a,&b,&c,&d)!=EOF)
                                     ^
0_0_31128343_29743.cpp:8:40: error: 'EOF' was not declared in this scope
  while( scanf("%d%d%d%d",&a,&b,&c,&d)!=EOF)
                                        ^
0_0_31128343_29743.cpp:22:22: error: 'printf' was not declared in this scope
   printf("S=%.2f\n",S);
                      ^