0_0_13690067_3962.cpp: In function 'int main()': 0_0_13690067_3962.cpp:6:22: error: 'scanf' was not declared in this scope scanf("%d %d", &a, &b); ^ 0_0_13690067_3962.cpp:7:19: error: 'printf' was not declared in this scope printf("%d", a + b); ^