c - I want to convert a char (poped from the stack) to integer -

char i[]=pop(); char j[]=pop(); b=atoi(i); a=atoi(j); 

i wanted pop char type element stack , convert int type. says

invalid initializer.

what problem?

if want char variable, use char variable, don't use char array.

change

char i[] = pop(); 

to

char = pop(); 

and likewise.

that said, atoi() won't relevant there. if want result of type int, use int variable.