十進位轉換成十六進位、16進位轉2進位

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <locale.h>int main() {    int i,v;    char bs[33];    char b[33];    char hs[9];    char h[9];    char s[4];    char *e;// 十進位整數轉二進位串；    i=1024;    ltoa(i,b,2);    sprintf(bs,"%032s",b);    printf("i=%d,bs=%s\n",i,bs);// 十進位整數轉十六進位串；    i=1024;    ltoa(i,h,16);    sprintf(hs,"%08s",h);    printf("i=%d,hs=%s\n",i,hs);// 十六進位字串轉成十進位數    strcpy(hs,"00000400");    sscanf(hs,"%x",&i);    printf("hs=%s,i=%d\n",hs,i);// 二進位字串轉化為十六進位字串；    strcpy(bs,"00000000000000000000010000000000");    i=strtol(bs,&e,2);    ltoa(i,h,16);    sprintf(hs,"%08s",h);    printf("bs=%s,hs=%s\n",bs,hs);// 二進位字串轉化為十進位數；    strcpy(bs,"00000000000000000000010000000000");    i=strtol(bs,&e,2);    printf("bs=%s,i=%d\n",bs,i);// 十六進位字串轉成二進位串    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字串轉十六進位串    strcpy(s,"a漢");    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); 

// 十六進位字串轉成漢字（GBK）及字元(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漢,hs=61BABA//hs=61BABA,s=a漢------解決方案--------------------#include <stdio.h>union decompose{int integer;struct{unsigned int hex0 : 4;unsigned int hex1 : 4;unsigned int hex2 : 4;unsigned int hex3 : 4;unsigned int hex4 : 4;unsigned int hex5 : 4;unsigned int hex6 : 4;unsigned int hex7 : 4;}hex4;};/* 此宏定義不能用於迴圈，即n不能是變數，只能是數字 * 因此比較適用與零散擷取位狀態或者位元組狀態 */#define GETHEX(x, n) (((union decompose){.integer = x}).hex4.hex##n) void test_getx(int tmp){printf("%X", GETHEX(tmp, 0));printf("%X", GETHEX(tmp, 1));printf("%X", GETHEX(tmp, 2));printf("%X", GETHEX(tmp, 3));printf("%X", GETHEX(tmp, 4));printf("%X", GETHEX(tmp, 5));printf("%X", GETHEX(tmp, 6));printf("%X\n", GETHEX(tmp, 7));}int main(){test_getx(100);return 0;}

MFC 16進位轉2進位

16 轉到10

//16轉10進位int CCIecClientSimulator12Dlg::HexToDec( char *s ){char *p = s;//空串返回0。if(*p == '\0')return 0;//忽略開頭的'0'字元while(*p == '0')p++;int dec = 0;char c;//迴圈直到字串結束。while(c = *p++){//dec乘16dec <<= 4;//數字字元。if(c >= '0' && c <= '9'){dec += c - '0';continue;}//小寫abcdef。if(c >= 'a' && c <= 'f'){dec += c - 'a' + 10;continue;}//大寫ABCDEF。if(c >= 'A' && c <= 'F'){dec += c - 'A' + 10;continue;}//沒有從任何一個if語句中結束，說明遇到了非法字元。return -1;}//正常結束迴圈，返回10進位整數值。return dec;}

10 轉到2 

UINT CCIecClientSimulator12Dlg::to2( int n ){int r=0;//double r=0;double b =10;int shang,yushu;shang=n;int i=0;while(shang!=0){yushu=shang%2;r=r+pow(b,i)*yushu;i++;shang=shang/2;}return r;}