First, the binky video may help. It’s a nice video about pointers. For arithmetic, here is an example: (Note that incrementing a pointer that contains a null pointer value strictly is undefined behavior. We used NULL because we were only interested in the value of the pointer. Normally, only use increment/decrement when pointing to elements … Read more
For variable argument functions like printf and scanf, the arguments are promoted, for example, any smaller integer types are promoted to int, float is promoted to double. scanf takes parameters of pointers, so the promotion rule takes no effect. It must use %f for float* and %lf for double*. printf will never see a float … Read more
Here goes my humble attempt to explain the concept to newbies around the world: (a color coded version on my blog too) A lot of people run to a lone phone booth (they don’t have mobile phones) to talk to their loved ones. The first person to catch the door-handle of the booth, is the … Read more
I have the following function : And I call it in main: I get “void value not ignored as it ought to be” but I don’t understand what is wrong.Why do I get this error?
Executive summary: Full answer: To determine the size of your array in bytes, you can use the sizeof operator: On my computer, ints are 4 bytes long, so n is 68. To determine the number of elements in the array, we can divide the total size of the array by the size of the array … Read more
Stack Smashing here is actually caused due to a protection mechanism used by gcc to detect buffer overflow errors. For example in the following snippet: The compiler, (in this case gcc) adds protection variables (called canaries) which have known values. An input string of size greater than 10 causes corruption of this variable resulting in … Read more
I got that error which cant figure out. I look over related questions but I dont give a meaning someone show me which part do I need to fix? [Error] void value not ignored as it ought to be My codes
“%f” is the (or at least one) correct format for a double. There is no format for a float, because if you attempt to pass a float to printf, it’ll be promoted to double before printf receives it1. “%lf” is also acceptable under the current standard — the l is specified as having no effect … Read more
I have the following function : And I call it in main: I get “void value not ignored as it ought to be” but I don’t understand what is wrong.Why do I get this error?
Stack Smashing here is actually caused due to a protection mechanism used by gcc to detect buffer overflow errors. For example in the following snippet: The compiler, (in this case gcc) adds protection variables (called canaries) which have known values. An input string of size greater than 10 causes corruption of this variable resulting in … Read more