View Compilation Error

0_0_29051599_31102.cpp: In function 'int main()':
0_0_29051599_31102.cpp:4:25: error: 'scanf' was not declared in this scope
 while(scanf("%d%d",&a,&b)!=EOF)
                         ^
0_0_29051599_31102.cpp:4:28: error: 'EOF' was not declared in this scope
 while(scanf("%d%d",&a,&b)!=EOF)
                            ^
0_0_29051599_31102.cpp:5:18: error: 'printf' was not declared in this scope
 printf("%d\n",a+b);
                  ^