View Compilation Error

0_0_22189649_16772.cpp: In function 'void input()':
0_0_22189649_16772.cpp:133:23: error: 'memset' was not declared in this scope
 memset(in,0,sizeof(in));
                       ^
0_0_22189649_16772.cpp:153:22: error: 'strcmp' was not declared in this scope
 while(strcmp(in,"END") != 0)
                      ^
0_0_22189649_16772.cpp: In function 'void cal()':
0_0_22189649_16772.cpp:471:21: error: 'memset' was not declared in this scope
 memset(d,0,sizeof(d));
                     ^