Complete the 8 queens 2 dimensional array program with backtracking in c++ code please

In the following program, o in a cell indicates no queen in that cell, and 1 indicates the presence of a queen. (Question: could we use a char or bool or ...?) and now, the code: int main(X // aside: why does main return anything at all, and why an int? int b[8]8]={0},row, col=0; // put the queen in the upper left square