When I enter the code in below, I click to compile and I get two identical error messages saying "error: subscripted value is neither array nor pointer."
Why is this? Thanks.
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Srce and trgt are both arrays, they are dummy variables in the copy_arr() function. This is how I defined them in the main() portion of the program:
double source[SIZE] = {1.5, 2.4, 3.3, 4.2, 5.1};
double target1[SIZE];
double target2[SIZE];
Should I define them within the copy_arr function as well? If so, how?
When I do that it says: syntax error before 'srce.' Copy_arr is still giving me problems. Here's the whole program:
#include <stdio.h>
# define SIZE 5
double copy_arr(srce, trgt, n);
double copy_ptr(srce, trgt, n);
int main ()
{
double source[SIZE] = {1.1, 2.2, 3.3, 4.4, 5.5};
double target1[SIZE];
double target2[SIZE];
copy_arr(source, target1, 5);
copy_ptr(source, target2, 5);
printf("%s\n", target1);
return 0;
printf("%s\n", target2);
return 0;
}
double copy_arr(srce, trgt, n)
{
for(int i = 0; i < n; i++)
srce[i] = trgt[i];
return trgt;
}
double copy_ptr(srce, trgt, n)
{
int i;
for(i = 0; i < n; i++)
*(&srce + i) = *(&trgt+i);
return trgt;
}
You didn't declare the type of the function parameters. If you don't declare a type, the compiler will try to assume one. Of course, it's probably not the type you want. So when the compiler sees that you're trying to subscript the parameter, it throws and error.
You also had your source and targets reversed as well as an extra return statement in your main function.
You also can't use %s in printf to print out doubles.
I think this is what your code should look like:
#include <stdio.h>
# define SIZE 5
double * copy_arr(double * srce, double * trgt, int n);
double * copy_ptr(double * srce, double * trgt, int n);
int main ()
{
int i;
double source[SIZE] = {1.1, 2.2, 3.3, 4.4, 5.5};
double target1[SIZE];
double target2[SIZE];
copy_arr(source, target1, SIZE);
copy_ptr(source, target2, SIZE);
for(i = 0; i < SIZE; i++)
printf("%f ", target1[i]);
printf("\n");
for(i = 0; i < SIZE; i++)
printf("%f ", target2[i]);
printf("\n");
return 0;
}
double * copy_arr(double * srce, double * trgt, int n)
{
for(int i = 0; i < n; i++)
trgt[i] = srce[i];
return trgt;
}
double * copy_ptr(double * srce, double * trgt, int n)
{
int i;
for(i = 0; i < n; i++)
*(trgt+i) = *(srce+i);
return trgt;
}
Note how you need to declare the parameters both in your function declarations at the top as well as in the function implementations at the bottom.
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by: ozoPosted on 2009-04-02 at 18:15:54ID: 24055972
what are srce and trgt?
they need to be arrays or pointers in in order for srce[i] or trgt[i] to make any sense