C语言：此错误是什么意思？

Question

TYPE *a = calloc(nelem, sizeof(TYPE));

It says "unable to resolve identifier TYPE". What does this mean?

Here is the code our professor gave us. We need to implement heapsort (did that in Java, and I know how it works, but I am a C virgin.)

Answer 1

When compiling using the code below:

gcc -std=c99 -DRAND -DPRNT -DTYPE={float, double} -D{BUBB, HEAP, INSR, MERG} *.c

You have to pick either float or double :

gcc -std=c99 -DRAND -DPRNT -DTYPE=float -D{BUBB, HEAP, INSR, MERG} *.c
gcc -std=c99 -DRAND -DPRNT -DTYPE=double -D{BUBB, HEAP, INSR, MERG} *.c

Similarly for BUBB , HEAP , INSR , MERG .

Answer 2

Add the following define to the begining of the file:

#define TYPE int

or

#define TYPE float

Take care that TYPE replacement should be a numerical type

Answer 3

compiler is not able to resolve TYPE, it must be typedef...you have to include headerfile where it is defined or else define it before use. eg typedef int TYPE;