Main.cc: In function ‘int main()’: Main.cc:4:8: error: expected unqualified-id before ‘,’ token int,a[100],n; ^ Main.cc:5:26: error: conflicting declaration ‘long long unsigned int a [100]’ unsigned long long a[100]; ^ Main.cc:4:9: note: previous declaration as ‘int a [100]’ int,a[100],n; ^ Main.cc:11:9: error: ‘i’ was not declared in this scope for(i=4;i<=n;i++); ^ Main.cc:11:5: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation] for(i=4;i<=n;i++); ^~~ Main.cc:12:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’ a[i]=a[i-3]+a[i-2]+a[i-1]; ^ Main.cc:12:4: error: ‘i’ was not declared in this scope a[i]=a[i-3]+a[i-2]+a[i-1]; ^