View Compilation Error

0_0_21680862_16452.cpp: In function 'int main()':
0_0_21680862_16452.cpp:36:44: error: 'strlen' was not declared in this scope
                 for(j=0;j<strlen(need[tran]);j++)
                                            ^
0_0_21680862_16452.cpp:51:44: error: 'strlen' was not declared in this scope
                 for(j=0;j<strlen(need[tran]);j++)
                                            ^