常用进制转换

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <locale.h>

 

int BitToDos()//2转10

{

    char sz[100]={0};

    strcpy(sz,"1000111101100001010");

    char* p = sz;

    int nlen = strlen(p);

    WORD dw = * (WORD*)p;

 

    int data=0;

    int base=1;

    char *pend = p+nlen-1;

    while (pend>=p)

    {

        data+= ( (*pend-'0') *base);

        base*=2;

        pend--;

    }

 

　　return data;

}

 

 

int main() {

    int i,v;

    char bs[33];

    char b[33];

    char hs[9];

    char h[9];

    char s[4];

    char *e;

 

// 十进制整数转二进制串；

    i=1024;

    ltoa(i,b,2);

    sprintf(bs,"%032s",b);

    printf("i=%d,bs=%s\n",i,bs);

// 十进制整数转十六进制串；

    i=1024;

    ltoa(i,h,16);

    sprintf(hs,"%08s",h);

    printf("i=%d,hs=%s\n",i,hs);

// 十六进制字符串转成十进制数

    strcpy(hs,"00000400");

    sscanf(hs,"%x",&i);

    printf("hs=%s,i=%d\n",hs,i);

// 二进制字符串转化为十六进制字符串；

    strcpy(bs,"00000000000000000000010000000000");

    i=strtol(bs,&e,2);

    ltoa(i,h,16);

    sprintf(hs,"%08s",h);

    printf("bs=%s,hs=%s\n",bs,hs);

// 二进制字符串转化为十进制数；

    strcpy(bs,"00000000000000000000010000000000");

    i=strtol(bs,&e,2);

    printf("bs=%s,i=%d\n",bs,i);

// 十六进制字符串转成二进制串

    strcpy(hs,"00000400");

    sscanf(hs,"%x",&i);

    ltoa(i,b,2);

    sprintf(bs,"%032s",b);

    printf("hs=%s,bs=%s\n",hs,bs);

// ASC\GBK字符串转十六进制串

    strcpy(s,"a汉");

    i=0;

    while (1) {

        if (0==s[i]) break;

        sprintf(hs+i*2,"%02X",(unsigned char)s[i]);

        i++;

    }

    setlocale(LC_ALL,"chs");

    printf("s=%s,hs=%s\n",s,hs);

// 十六进制字符串转成汉字（GBK）及字符(ASC)

    strcpy(hs,"61BABA");

    i=0;

    while (1) {

        if (1!=sscanf(hs+i*2,"%2x",&v)) break;

        s[i]=(char)v;

        i++;

    }

    s[i]=0;

    printf("hs=%s,s=%s\n",hs,s);

 

    return 0;

 

}

//i=1024,bs=00000000000000000000010000000000

//i=1024,hs=00000400

//hs=00000400,i=1024

//bs=00000000000000000000010000000000,hs=00000400

//bs=00000000000000000000010000000000,i=1024

//hs=00000400,bs=00000000000000000000010000000000

//s=a汉,hs=61BABA

//hs=61BABA,s=a汉