View Compilation Error

0_0_23072119_25398.cpp: In function 'int main()':
0_0_23072119_25398.cpp:8:23: error: 'scanf' was not declared in this scope
     scanf("%d%d",&a,&b);
                       ^
0_0_23072119_25398.cpp:32:29: error: 'printf' was not declared in this scope
         printf("%d\n",number);
                             ^