0_0_34061901_24772.cpp: In function 'int main()': 0_0_34061901_24772.cpp:5:23: error: 'scanf' was not declared in this scope scanf("%d %d",&a,&b); ^ 0_0_34061901_24772.cpp:7:21: error: 'printf' was not declared in this scope printf("%d\n",sum); ^