foo.cpp:1:9: error: #include expects "FILENAME" or <FILENAME>
 #include:stdio.h:
         ^
foo.cpp: In function 'int main()':
foo.cpp:5:20: error: 'scanf' was not declared in this scope
 scanf("%d %d",&a,&b);
                    ^
foo.cpp:6:16: error: 'printf' was not declared in this scope
 printf("%d",b%a);
                ^