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Tagged with pointer-to-pointer pass-by-value
4 questions
1
vote
4
answers
102
views
char * gives garbage value when pointing to a variable of a function in C
When i pass a pointer to a function and then change the pointer to a another location of the memory, I get SIGSEV or garbage values. Where is a code to demonstrate that:
#include <stdio.h>
void ...
2
votes
2
answers
115
views
why do I need to add an & sign while allocating a memory space inside a functions? [duplicate]
I wanted to try making an allocate function for a cell in a list, but when using it inside another functions, I need to add an "&" sign
I am aware of what "&" means in c (...
- 33
0
votes
3
answers
129
views
How to understand secondary pointer?
i want to ask a question about pointer:
void fun(const char** a) {...}
1.
const char* b = nullptr;
fun(&b);
2.
const char** b = nullptr;
fun(b);
why use 1 but not 2?
1 is good, 2 donnot work
- 23
16
votes
2
answers
6k
views
Why the second argument to pthread_join() is a **, a pointer to a pointer?
I am new to using pthread and also not that familiar with pointers to pointers. Could somebody perhaps explain why the second argument of pthread_join() is a void **. Why is it designed like this.
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- 493