numstr.c

数据进制转换源码

#include <stdlib.h>
#include "./numstr.h"
#include <stdio.h>

int main()
{	
	printf("7 in bin = %s\n\"3F\" in decimal = %d\n",
				formatBin(7), parseHex("3F"));
	return 0;
	
}
int parseBin(char* bin)
{
	//Using dibble-dobble method
	int res;
	char* ptr;
	
	res = 0;
	ptr = bin;
	
	while((*ptr)=='0') ptr++;
	
	while(*ptr)
	{
		if((*ptr!='0')&&(*ptr!='1')) return -1;
		res = res*2+*ptr-'0';
		ptr++;
	}
	
	return res;	
}

int parseOct(char* oct)
{
	int res;
	char* ptr;
	
	res = 0;
	ptr = oct;
	
	while((*ptr)=='0') ptr++;
	
	while(*ptr)
	{
		if((*ptr<'0')||(*ptr>'7')) return -1;
		res = res*8+*ptr-'0';
		ptr++;
	}
	
	return res;
}

int parseDec(char* dec)
{
	int res;
	char* ptr;
	
	res = 0;
	ptr = dec;
	
	while((*ptr)=='0') ptr++;
	
	while(*ptr)
	{
		if((*ptr<'0')||(*ptr>'9')) return -1;
		res = res*10+*ptr-'0';
		ptr++;
	}
	
	return res;
}

int parseHex(char* hex)
{
	int res;
	int val;
	char* ptr;
	
	res = 0;
	ptr = hex;
	
	while((*ptr)=='0') ptr++;
	
	while(*ptr)
	{
		if(!((*ptr<'0')||(*ptr>'9')))
		{
			val = *ptr - '0';
		}
		else if(!((*ptr<'a')||(*ptr>'f')))
		{
			val = *ptr - 'a' + 10;
		}
		else if(!((*ptr<'A')||(*ptr>'F')))
		{
			val = *ptr - 'A' + 10;
		}
		else
		{
			return -1;
		}
		
		res = res*16+val;
		
		ptr++;
	}
	
	return res;
}

char* formatBin(int bin)
{
	char* str;
	int i, j, m, k;
	
	i = 0;
	j = bin;
	k = 1;
	
	while(j/=2) i++; i++;	
	
	str = (char*)malloc(i+1);
	j=bin;
	
	while(k<=i)
	{
		str[i-k] = j%2 + '0';
		k++;
		j/= 2;
	}
	
	str[i]=0;
	
	return str;
}

char* formatOct(int oct)
{
	char* str;
	int i, j, m, k;
	
	i = 0;
	j = oct;
	k = 1;
	
	while(j/=8) i++; i++;
	
	str = (char*)malloc(i+1);
	j=oct;
	
	while(k<=i)
	{
		str[i-k] = j%8 + '0';
		k++;
		j/= 8;
	}
	
	str[i]=0;
	
	return str;
}

char* formatDec(int dec)
{
	char* str;
	int i, j, m, k;
	
	i = 0;
	j = dec;
	k = 1;
	
	while(j/=10) i++; i++;
	
	str = (char*)malloc(i+1);
	j=dec;
	
	while(k<=i)
	{
		str[i-k] = j%10 + '0';
		k++;
		j/= 10;
	}
	
	str[i]=0;
	
	return str;
}

char* formatHex(int hex)
{
	char* str;
	int i, j, m, k;
	
	i = 0;
	j = hex;
	k = 1;
	
	while(j/=16) i++; i++;	
	
	str = (char*)malloc(i+1);
	j=hex;
	
	while(k<=i)
	{
		str[i-k] = (j%16)<10?(j%16)+'0':(j%16)-10+'A';
		k++;
		j/= 16;
	}
	
	str[i]=0;
	
	return str;
}

char* formatHexL(int hex)
{
	char* str;
	int i, j, m, k;
	
	i = 0;
	j = hex;
	k = 1;
	
	while(j/=16) i++; i++;	
	
	str = (char*)malloc(i+1);
	j=hex;
	
	while(k<=i)
	{
		str[i-k] = (j%16)<10?(j%16)+'0':(j%16)-10+'a';
		k++;
		j/= 16;
	}
	
	str[i]=0;
	
	return str;
}