Hi, I have one doubt may be so many guys answer this. We know that malloc use to allocate dynamic memory. But while writing programs we use to check with NULL. Char *p; p=(char *)malloc(100); If(p==NULL)printf(“mem alloction failed”);// <-----(When dynamic allocation fail) 1. When will memory allocation fail? 2. I have a scenario that it should not be fail at any cost for that what I should do?