Accessing Structure elements in C
I am trying to access the element asd7 inside the innermost structu开发者_运维技巧re, here is my code:
#include <stdio.h>
int main()
{
struct asd
{
int asd;
struct asd1
{
int asd1;
struct asd6
{
int asd7;
}asd6;
}asd1;
}asd;
int asd10;
int asd11;
struct asd *ptr1;
struct asd1 *ptr2;
struct asd6 *ptr3;
asd.asd1.asd6.asd7=10;
printf("%d\n",asd.asd1.asd6.asd7);
}
The code is compiling but I am unable to run it - I am getting a segmentation fault. Any help would be great.
Thanks
The output is:
10
Exited: ExitFailure 3
There's nothing wrong with your code that a simple return 0;
at the end wouldn't fix :-)
Without:
pax> cat qq.c ; gcc -o qq qq.c ; ./qq ; echo rc=$?
#include <stdio.h>
int main (void) {
struct asd {
int asd;
struct asd1 {
int asd1;
struct asd6 {
int asd7;
} asd6;
} asd1;
} asd;
asd.asd1.asd6.asd7=10;
printf("%d\n",asd.asd1.asd6.asd7);
//return 0;
}
10
rc=3
With:
pax> cat qq.c ; gcc -o qq qq.c ; ./qq ; echo rc=$?
#include <stdio.h>
int main (void) {
struct asd {
int asd;
struct asd1 {
int asd1;
struct asd6 {
int asd7;
} asd6;
} asd1;
} asd;
asd.asd1.asd6.asd7=10;
printf("%d\n",asd.asd1.asd6.asd7);
return 0;
}
10
rc=0
The other alternative is to switch to a C99 compiler (or mode). The C99 standard states, in part (paraphrased):
If the return type of the main function is a type compatible with int, a return from the initial call to the main function is equivalent to calling the exit function with the value returned by the main function as its argument: reaching the } that terminates the main function returns a value of 0.
(my italics).
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