View Compilation Error

0_0_36622641_19035.cpp: In function 'int main()':
0_0_36622641_19035.cpp:5:1: error: 'string' was not declared in this scope
 string s;
 ^
0_0_36622641_19035.cpp:7:19: error: 's' was not declared in this scope
 while(scanf("%s",&s)!=EOF){
                   ^
0_0_36622641_19035.cpp:18:21: error: 's' was not declared in this scope
 printf("%c %c %c\n",s[0],s[1],s[2]);
                     ^