Compile Error
/in/foo.c: In function 'main':
/in/foo.c:8:9: error: 'cin' undeclared (first use in this function)
8 | cin >> n;
| ^~~
/in/foo.c:8:9: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:15:9: error: 'cout' undeclared (first use in this function)
15 | cout << r;
| ^~~~
代码
#include <stdio.h>
int main()
{
int n;
int arr[100001];
int r;
cin >> n;
for(int i=0;i<n;i++){
cin >> arr[i];
}
for(int i=0;i<n;i++){
r += arr[i];
}
cout << r;
}
