C code/ Floating point num

[Mina2016]

Hello,
In C code below why I cannot use float to declare pointer to the floating point number. It has used “char” but I don’t understand why.
could you explain it to me?

---

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
#include "stm321476xx.h"
‡include <stdio.h>
 
unsigned int a = 1;
unsigned int b, c;
float x = 3.0;
 
int main () {
// declare pointer to the  floating point number x
//
char *ptr = (char *)&x;

---

Thanks

 

[vishweshgm]

Hi,
Is the code posted complete code?

 

[Mina2016]

Hi,
Is the code posted complete code?

no It is not. In this part of the code, I just need to declare pointer to floating number x. The other parts are about bitwise operations.

 

[vishweshgm]

ok, So what's the problem?

float* fptr = &x;

should work.

 

[Mina2016]

My teacher told us that we cannot use float pointer here. I am not sure, but I guess due to having “int main “command, we cannot point to the floating numbers by float pointer.

 

[vishweshgm]

int main has nothing to do with this.
I suggest you replace the char pointer with float pointer and run the program and see what does not work.
We can help you if you have clear problem statement.