xxxxxxxxxx
#include<stdio.h>
#include<stdarg.h>
void Myprintf(char *, ); //Our printf function
char* convert(unsigned int, int); //Convert integer number into octal, hex, etc.
int main()
{
Myprintf(" WWW.FIRMCODES.COM \n %d", 9);
return 0;
}
void Myprintf(char* format, )
{
char *traverse;
unsigned int i;
char *s;
//Module 1: Initializing Myprintf's arguments
va_list arg;
va_start(arg, format);
for(traverse = format; *traverse != '\0'; traverse++)
{
while( *traverse != '%' )
{
putchar(*traverse);
traverse++;
}
traverse++;
//Module 2: Fetching and executing arguments
switch(*traverse)
{
case 'c' : i = va_arg(arg,int); //Fetch char argument
putchar(i);
break;
case 'd' : i = va_arg(arg,int); //Fetch Decimal/Integer argument
if(i<0)
{
i = -i;
putchar('-');
}
puts(convert(i,10));
break;
case 'o': i = va_arg(arg,unsigned int); //Fetch Octal representation
puts(convert(i,8));
break;
case 's': s = va_arg(arg,char *); //Fetch string
puts(s);
break;
case 'x': i = va_arg(arg,unsigned int); //Fetch Hexadecimal representation
puts(convert(i,16));
break;
}
}
//Module 3: Closing argument list to necessary clean-up
va_end(arg);
}
char *convert(unsigned int num, int base)
{
static char Representation[]= "0123456789ABCDEF";
static char buffer[50];
char *ptr;
ptr = &buffer[49];
*ptr = '\0';
do
{
*--ptr = Representation[num%base];
num /= base;
}while(num != 0);
return(ptr);
}