View Compilation Error

0_0_22263828_11883.cpp: In function 'int main()':
0_0_22263828_11883.cpp:14:22: error: 'strcmp' was not declared in this scope
    if (strcmp(c[i], a) == 0) m = i;
                      ^
0_0_22263828_11883.cpp:15:22: error: 'strcmp' was not declared in this scope
    if (strcmp(c[i], b) == 0) n = i;
                      ^