How would you display the memory representation of a C variable?

Here we will see how to print the memory representation of a C variable. Here we will display integers, floating point numbers and pointers.

To solve this problem we have to follow the following steps -

• Get address and size of variable
• Convert address type to character pointer to get byte address
• Now loop to get the size of the variable and print the value of the type converted pointer.

Example

#include <stdio.h>
typedef unsigned char *byte_pointer; //create byte pointer using char*
void disp_bytes(byte_pointer ptr, int len) {
    //this will take byte pointer, and print memory content
   int i;
   for (i = 0; i < len; i++)
      printf(" %.2x", ptr[i]);
   printf("</p><p>");
}
void disp_int(int x) {
   disp_bytes((byte_pointer) &x, sizeof(int));
}
void disp_float(float x) {
   disp_bytes((byte_pointer) &x, sizeof(float));
}
void disp_pointer(void *x) {
   disp_bytes((byte_pointer) &x, sizeof(void *));
}
main() {
   int i = 5;
   float f = 2.0;
   int *p = &i;
   disp_int(i);
   disp_float(f);
   disp_pointer(p);
   disp_int(i);
}

Output

05 00 00 00
00 00 00 40
3c fe 22 00 00 00 00 00
05 00 00 00

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