comp.cpp: In function `int main()': comp.cpp:15: warning: passing NULL used for non-pointer argument passing 2 of ` void* memset(void*, int, unsigned int)' comp.cpp:15: warning: argument to non-pointer type `int' from NULL comp.cpp:16: warning: passing NULL used for non-pointer argument passing 2 of ` void* memset(void*, int, unsigned int)' comp.cpp:16: warning: argument to non-pointer type `int' from NULL comp.cpp:19: warning: comparison between signed and unsigned integer expressions /tmp/ccI0uQUr.o(.text+0xcd): In function `main': : the `gets' function is dangerous and should not be used.