View Compilation Error

0_0_22157350_14278.cpp: In function 'double prim(double (*)[105], int)':
0_0_22157350_14278.cpp:24:37: error: 'memset' was not declared in this scope
     memset(visit,false,sizeof(visit));
                                     ^
0_0_22157350_14278.cpp: In function 'int main()':
0_0_22157350_14278.cpp:54:33: error: 'memset' was not declared in this scope
         memset(num,0,sizeof(num));
                                 ^