0_0_19216136_20764.cpp: In function 'int main()': 0_0_19216136_20764.cpp:53:18: error: 'scanf' was not declared in this scope scanf("%d",&t); ^ 0_0_19216136_20764.cpp:85:29: error: 'printf' was not declared in this scope printf("%.8lf/n",m/2); ^