View Compilation Error

0_0_17593394_12338.cpp: In function 'int Search(char*, int)':
0_0_17593394_12338.cpp:19:35: error: 'strcmp' was not declared in this scope
         if(strcmp(s,dic[dicset][i])==0)  
                                   ^
0_0_17593394_12338.cpp: In function 'int main()':
0_0_17593394_12338.cpp:32:30: error: 'strcmp' was not declared in this scope
         if(strcmp(str,"@END@")==0)  
                              ^
0_0_17593394_12338.cpp:40:27: error: 'strlen' was not declared in this scope
         while(i<strlen(str))  
                           ^
0_0_17593394_12338.cpp:44:32: error: 'strcpy' was not declared in this scope
         strcpy(dic[0][cnt],str1);  
                                ^
0_0_17593394_12338.cpp:66:47: error: 'strlen' was not declared in this scope
                 for(i=1;i<strlen(dic[0][index])-1;i++)  
                                               ^