c语言把一个数字转成16进制字符串,用c语言写一个函数把十进制转换成十六进制解决方案...

用c语言写一个函数把十进制转换成十六进制

用c语言写一个函数把十进制转换成十六进制

网上找到一些，感觉有占乱

------解决方案--------------------

#include 

#include 

#include 

#include 

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

------解决方案--------------------

#include 

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;

};

/* 此宏定义不能用于循环，即n不能是变量，只能是数字

* 因此比较适用与零散获取位状态或者字节状态

*/

#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;

}