0_0_39377647_25434.cpp:1:1: error: '::main' must return 'int' 1 | void main(){ | ^~~~ 0_0_39377647_25434.cpp: In function 'int main()': 0_0_39377647_25434.cpp:3:1: error: 'cin' was not declared in this scope 3 | cin<<a; | ^~~