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How will you show memory representation of C variables?
Here we will see how to print the memory representation of C variables. Here we will show integers, floats, and pointers.
To solve this problem, we have to follow these steps −
- Get the address and the size of the variable
- Typecast the address to the character pointer to get byte address
- Now loop for the size of the variable and print the value of typecasted 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("
");
}
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
Updated on: 30-Jul-2019
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