View Compilation Error

0_0_24384673_52.cpp: In function 'int main()':
0_0_24384673_52.cpp:16:18: error: 'strcmp' was not declared in this scope
   if (strcmp(a, b) == 0)
                  ^
0_0_24384673_52.cpp:23:22: error: 'strcmp' was not declared in this scope
    if (strcmp(a, x[i]) == 0)
                      ^
0_0_24384673_52.cpp:25:22: error: 'strcmp' was not declared in this scope
    if (strcmp(b, x[i]) == 0)
                      ^