Main.cc: In function 'int main()':
Main.cc:8:33: error: redeclaration of 'int i'
int m=0,n=0,b=0,i=0,a=10000,i=0;
^
Main.cc:8:21: note: 'int i' previously declared here
int m=0,n=0,b=0,i=0,a=10000,i=0;
^
Main.cc:8:9: warning: unused variable 'm' [-Wunused-variable]
int m=0,n=0,b=0,i=0,a=10000,i=0;
^