View Compilation Error

0_0_15101503_2837.cpp: In function 'void getPrime()':
0_0_15101503_2837.cpp:17:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_15101503_2837.cpp: In function 'void getPrime2()':
0_0_15101503_2837.cpp:32:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_15101503_2837.cpp: In function 'void getPrime3()':
0_0_15101503_2837.cpp:52:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^
0_0_15101503_2837.cpp: In function 'void getPrime4()':
0_0_15101503_2837.cpp:83:31: error: 'memset' was not declared in this scope
     memset(phi, 0, sizeof(phi));
                               ^
0_0_15101503_2837.cpp: In function 'void getPrime5()':
0_0_15101503_2837.cpp:107:31: error: 'memset' was not declared in this scope
     memset(vis, 0, sizeof(vis));
                               ^