2.55 Compile and Run
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Problem:
Compile and run the sample code that uses show_bytes
on different machines to which you have access. Determine he byte orderings used by these machines.
code:
#include <stdio.h>
typedef unsigned char* byte_pointer;
void show_bytes(byte_pointer start, size_t len) {
size_t i;
for(i = 0; i < len; i++)
printf(" %.2x", start[i]);
printf("\n");
}
void show_int(int x) {
show_bytes((byte_pointer) &x, sizeof(int));
}
void show_float(float x) {
show_bytes((byte_pointer) &x, sizeof(float));
}
void show_pointer(void* x) {
show_bytes((byte_pointer) &x, sizeof(void *));
}
void test_show_bytes(int val) {
int ival = val;
float fval = (float)val;
int *pval = &val;
show_int(ival);
show_float(fval);
show_pointer(pval);
}
int main() {
int val = 12345;
test_show_bytes(val);
return 0;
}
compile:
gcc -m64 show_bytes.c -o show_bytes
execute:
./show_bytes
result:
39 30 00 00
00 e4 40 46
bc 68 1f b6 fd 7f 00 00
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