View Compilation Error

0_0_34122873_1136.cpp: In function 'int main()':
0_0_34122873_1136.cpp:4:28: error: 'scanf' was not declared in this scope
    while(scanf("%d%d",&a,&b)!=EOF)
                            ^
0_0_34122873_1136.cpp:4:31: error: 'EOF' was not declared in this scope
    while(scanf("%d%d",&a,&b)!=EOF)
                               ^
0_0_34122873_1136.cpp:7:21: error: 'printf' was not declared in this scope
     printf("%d\n",&c);
                     ^