View Compilation Error

0_0_15719875_15589.cpp: In function 'int main()':
0_0_15719875_15589.cpp:4:30: error: 'scanf' was not declared in this scope
     while((scanf("%d%d",&x,&y)!=EOF)&&(x!=0||y!=0))
                              ^
0_0_15719875_15589.cpp:4:33: error: 'EOF' was not declared in this scope
     while((scanf("%d%d",&x,&y)!=EOF)&&(x!=0||y!=0))
                                 ^
0_0_15719875_15589.cpp:10:29: error: 'sqrt' was not declared in this scope
            for(j=2;j<=sqrt(m);j++)
                             ^
0_0_15719875_15589.cpp:17:21: error: 'printf' was not declared in this scope
        printf("OK\n");
                     ^
0_0_15719875_15589.cpp:19:24: error: 'printf' was not declared in this scope
        printf("Sorry\n");
                        ^