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float_bytes.c
109 lines (92 loc) · 2.36 KB
/
float_bytes.c
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#include<stdio.h>
#include<string.h>
#define PRINT_CHAR 1
#define PRINT_INT 2
#define PRINT_FLOAT 3
typedef unsigned char *byte_pointer;
void show_bytes(byte_pointer start, int len);
void show_int(int ix);
void show_float(float fx);
void show_pointer(void *px);
int print_format;
int main(int argc, char *argv[])
{
char carray[5] = {'a','b','c','d','e'};
int ix = 11111;
float fx = -0.75;
int idx;
//validate the command line
if( argc < 2 || !((strcasecmp(argv[1], "-all") == 0)
|| (strcasecmp(argv[1], "-char") == 0)
|| (strcasecmp(argv[1], "-int") == 0 )
|| (strcasecmp(argv[1], "-fl") == 0 )))
{
printf ("%s", "Invalid input: ");
//display the command line input
for (idx = 0; idx<argc; idx++)
{
printf ("argv[%d] = %s ", idx, argv[idx]);
}
printf ("\n");
printf ( "%s\n", "The input format: program -[all, char, int, fl] number\n");
} else {
if (strcasecmp(argv[1], "-char") == 0)
{
print_format = PRINT_CHAR;
printf("show_bytes...\n");
show_bytes(carray, 5);
//show_pointer(carray);
}
if (strcasecmp(argv[1], "-int") == 0)
{
print_format = PRINT_INT;
show_int(ix);
show_pointer(&ix);
}
if (strcasecmp(argv[1], "-fl") == 0)
{
print_format = PRINT_FLOAT;
show_float(fx);
show_pointer(&fx);
}
}
// printf("show_bytes...\n");
// show_bytes(carray, 5);
// show_int(ix);
// show_float(fx);
}
void show_bytes(byte_pointer start, int len)
{
int i;
for (i=0; i<len; i++)
{
if ( print_format == PRINT_CHAR ) {
printf("%c=0x%x", start[i], start[i]);
} else {
printf("%x", start[i], start[i]);
}
printf("\n");
}
/*
for (i=0; i<len; i++)
{
printf(" %d", start[i]);
printf("\n");
}
*/
}
void show_int(int start)
{
printf("show_int... %d\n", start);
show_bytes((byte_pointer) &start, sizeof(int));
}
void show_float(float start)
{
printf("show_float...\n");
show_bytes((byte_pointer) &start, sizeof(float));
}
void show_pointer(void *start)
{
printf("show_pointer...\n");
show_bytes((byte_pointer) &start, sizeof(void *));
}