Main.cc: In function 'int main()':
Main.cc:11:18: warning: left operand of comma operator has no effect [-Wunused-value]
for(int i=0;a[i]!='\0',i++)
^
Main.cc:11:28: error: expected ';' before ')' token
for(int i=0;a[i]!='\0',i++)
^