View Compilation Error

0_0_30558015_25576.cpp: In function 'int main()':
0_0_30558015_25576.cpp:16:29: error: 'strcmp' was not declared in this scope
    if (strcmp(str, "Beijing") == 0) {
                             ^
0_0_30558015_25576.cpp:19:32: error: 'strcmp' was not declared in this scope
    if (strcmp(str, "Washington") == 0) {
                                ^
0_0_30558015_25576.cpp:22:28: error: 'strcmp' was not declared in this scope
    if (strcmp(str, "London") == 0) {
                            ^
0_0_30558015_25576.cpp:25:28: error: 'strcmp' was not declared in this scope
    if (strcmp(str, "Moscow") == 0) {
                            ^
0_0_30558015_25576.cpp:39:26: error: 'strcmp' was not declared in this scope
     if (strcmp(time, "AM") == 0) {
                          ^
0_0_30558015_25576.cpp:55:26: error: 'strcmp' was not declared in this scope
     if (strcmp(time, "AM") == 0) {
                          ^