View Compilation Error

0_0_23588056_15278.cpp: In function 'bool search(char*)':
0_0_23588056_15278.cpp:6:21: error: 'strlen' was not declared in this scope
     int len=strlen(a),i;  
                     ^
0_0_23588056_15278.cpp:7:9: error: 'i' was not declared in this scope
     for(i=0;i<len;i++)  
         ^
0_0_23588056_15278.cpp:10:8: error: 'i' was not declared in this scope
     if(i>=len)  
        ^
0_0_23588056_15278.cpp: In function 'int main()':
0_0_23588056_15278.cpp:24:37: error: 'memset' was not declared in this scope
         memset(tempa,0,sizeof(tempa));      //重置  
                                     ^