Help with dd array

[Singleton]

what is wrong with my main fn?



void f(char** p)

{

printf("%s", p[0]);

}



void main()

{

char a[50][50];

strcpy(a[0], "hello");

f(a);

}

 

[pemo]

what is wrong with my main fn?



void f(char** p)

{

printf("%s", p[0]);

}



void main()

{

char a[50][50];

strcpy(a[0], "hello");

f(a);

}

Gosh, it's hard to know where to start ... but maybe you could say something
about what you expect this to be doing?

Something like this ...??

#include <stdlib.h>

void f(char * p)

{
printf("%c", p[0]);
}



int main(void)

{
char a[50][50];

a[0][0] = 'e';

f(&a[0][0]);
}

a is an array of 50 arrays of 50 characters. Is that what you thought it
was?

 

[Richard Heathfield]

Singleton said:

what is wrong with my main fn?



void f(char** p)

{

printf("%s", p[0]);

Undefined behaviour - calling a variadic function without a function

}



void main()

In C, main() returns int.

{

char a[50][50];

strcpy(a[0], "hello");

f(a);

f takes char **, but you're not passing a char **. In a value context, the
name of an array decays into a pointer to its first element, so a has the
type char (*)[50], which is not the same as char **.