You are incrementing ptr, therefore changing the address that it points to. You can’t do that. In your case, have a separate pointer, let’s say char * p = ptr and do your operations with p leaving ptr intact so you can free(ptr) later. EDIT Taking a second look at your code, I found that … Read more
This is illegal in C. Initializer lists must be constant compile time expressions. Do the following instead:
The interface. Like everyone else has said, stdin is a FILE * as defined by the standard c library. You can use some of the higher level interfaces like fread, fwrite, and fprintf. On the other hand, STDIN_FILENO is just a file descriptor (almost certainly 0). This uses a slight lower level interface through the … Read more
The modulo operator in C will give the remainder that is left over when one number is divided by another. For example, 23 % 4 will result in 3 since 23 is not evenly divisible by 4, and a remainder of 3 is left over. If you want to output whether or not a number … Read more
Use the z modifier:
Standard C doesn’t define binary constants. There’s a GNU C extension though (among popular compilers, clang adapts it as well): the 0b or 0B prefixes: If you want to stick with standard C, then there’s an option: you can combine a macro and a function to create an almost readable “binary constant” feature: And then … Read more
atoi can do that for you Example:
You can’t initialise revS in that manner, you need a very specific thing to the right of the =. From C11 6.7.9 Initialization /14, /16: 14/ An array of character type may be initialized by a character string literal or UTF−8 string literal, optionally enclosed in braces. Successive bytes of the string literal (including the … Read more
You can use a time_t struct and clock() function from time.h. Store the start time in a time_t struct by using clock() and check the elapsed time by comparing the difference between stored time and current time.
You want to do this: strcmp(buffer, “exit\n”) That is, when you enter your string and press “enter”, the newline becomes a part of buffer. Alternately, use strncmp(), which only compares n characters of the string