View Compilation Error

0_0_35016617_1503.cpp: In function 'int main()':
0_0_35016617_1503.cpp:4:46: error: 'malloc' was not declared in this scope
     char *ch=(char*)malloc(sizeof(char) * 100);
                                              ^
In file included from 0_0_35016617_1503.cpp:1:0:
0_0_35016617_1503.cpp:6:21: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     while(gets(ch)!=EOF)
                     ^