Main.cc: In function 'int main()': Main.cc:7:20: error: conflicting declaration 'int a' int a[10001],m,a=-10001,b=10001; ^ Main.cc:7:9: error: 'a' has a previous declaration as 'int a [10001]' int a[10001],m,a=-10001,b=10001; ^ Main.cc:11:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive] if(a[i]>a){ ^ Main.cc:12:14: error: incompatible types in assignment of 'int' to 'int [10001]' a=a[i]; ^