Basic C programming help

[HAL9000]

Can anyone explain to me how to do the following:

I have this code

typedef struct name{
some irrelevant crap}

name nam[10][15];

How do I get it to print out 15 or 10? Or whatever values are in those spots.

Basic, badly explained but I'm tired and stressed, anyone?

 

[Cogman]

You have to go through each element of the struct that you want to print out and do it in whatever fashion you need.

For example (and pardon my C++ code if it sneaks in, I'll try and keep things close to C, but c++ still might slip in).

Lets say your stuct looked like this.

struct myStruct
{
   float a;
   int b;
   int d;
}

To display the data in the struct, you would do something like this

void displayStruct(myStruct* thing)
{
   printf("a: %f, b: %d, c: %d\n", thing->a, thing->b, thing->c);
}

if you had an array of structs, then you would just loop through each and print out their data. So something like this

for (int i = 0; i < numStructs; ++i)
{
   displayStruct(&structArray[i]);
}

A 2d array is the same thing but with more loops.

 

[HAL9000]

You have to go through each element of the struct that you want to print out and do it in whatever fashion you need.

For example (and pardon my C++ code if it sneaks in, I'll try and keep things close to C, but c++ still might slip in).

Lets say your stuct looked like this.

struct myStruct
{
   float a;
   int b;
   int d;
}

To display the data in the struct, you would do something like this

void displayStruct(myStruct* thing)
{
   printf("a: %f, b: %d, c: %d\n", thing->a, thing->b, thing->c);
}

if you had an array of structs, then you would just loop through each and print out their data. So something like this

for (int i = 0; i < numStructs; ++i)
{
   displayStruct(&structArray[i]);
}

A 2d array is the same thing but with more loops.

That's very helpful thankyou. 🙂

 

[uclabachelor]

Can anyone explain to me how to do the following:

I have this code

typedef struct name{
some irrelevant crap}

name nam[10][15];

How do I get it to print out 15 or 10? Or whatever values are in those spots.

Basic, badly explained but I'm tired and stressed, anyone?

sizeof(name) gives you the # of bytes allocated per instance of name.

sizeof(nam) gives you the total bytes allocated for the array nam.

 

[slpaulson]

If your code is going to rely on the size of your array dimensions, I'd use #defines to define the dimensions.

I'm always paranoid that using sizeof(variablename) is going to include some padding bytes which might throw your logic off.