View Compilation Error

0_0_13177653_1658.cpp: In function 'int main()':
0_0_13177653_1658.cpp:17:23: error: 'strcmp' was not declared in this scope
    if(strcmp("Caps", a) == 0)
                       ^
0_0_13177653_1658.cpp:25:24: error: 'strcmp' was not declared in this scope
    if(strcmp("Shift", a) == 0)
                        ^