View Compilation Error

0_0_13806268_31832.cpp: In function 'void er_fun(int)':
0_0_13806268_31832.cpp:24:51: error: 'memset' was not declared in this scope
             memset(tp2.martix,0,sizeof(tp2.martix));   
                                                   ^
0_0_13806268_31832.cpp:37:47: error: 'memset' was not declared in this scope
         memset(tp3.martix,0,sizeof(tp3.martix));   
                                               ^