Standard input is empty
prog.c: In function ‘main’: prog.c:5:19: warning: left-hand operand of comma expression has no effect [-Wunused-value] for(i = 1; i < 20, i += 2){ ^ prog.c:5:27: error: expected ‘;’ before ‘)’ token for(i = 1; i < 20, i += 2){ ^
Standard output is empty