View Compilation Error

0_0_34794502_14377.cpp: In function 'int main()':
0_0_34794502_14377.cpp:4:17: error: 'scanf' was not declared in this scope
    scanf("%d",&N);
                 ^
0_0_34794502_14377.cpp:14:25: error: 'printf' was not declared in this scope
        printf("%d\n",x-1);
                         ^