0_0_29162997_9613.cpp: In function 'int main()': 0_0_29162997_9613.cpp:6:21: error: 'scanf' was not declared in this scope scanf("%d%d",&a,&b); ^ 0_0_29162997_9613.cpp:7:20: error: 'printf' was not declared in this scope printf("%d\n",a+b); ^