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#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
#include <stdio.h>
#pragma pack(push,1)
union U {
unsigned char byte;
struct BF {
unsigned int b0:1;//a
unsigned int b1:1;//b
unsigned int b2:1;//c
} bf;
} u;
#pragma pack(pop)
unsigned char bt;
int a,b,c;
int main() {
for (bt=0;bt<8;bt++) {
u.byte=(unsigned char)bt;
a=u.bf.b0;
b=u.bf.b1;
c=u.bf.b2;
printf("byte 0x%02x -- c:%d b:%d a:%d\n",bt,c,b,a);
}
for (c=0;c<2;c++)
for (b=0;b<2;b++)
for (a=0;a<2;a++) {
u.bf.b0=a;
u.bf.b1=b;
u.bf.b2=c;
bt=u.byte;
printf("c:%d b:%d a:%d -- byte 0x%02x\n",c,b,a,bt);
}
return 0;
}
//byte 0x00 -- c:0 b:0 a:0
//byte 0x01 -- c:0 b:0 a:1
//byte 0x02 -- c:0 b:1 a:0
//byte 0x03 -- c:0 b:1 a:1
//byte 0x04 -- c:1 b:0 a:0
//byte 0x05 -- c:1 b:0 a:1
//byte 0x06 -- c:1 b:1 a:0
//byte 0x07 -- c:1 b:1 a:1
//c:0 b:0 a:0 -- byte 0x00
//c:0 b:0 a:1 -- byte 0x01
//c:0 b:1 a:0 -- byte 0x02
//c:0 b:1 a:1 -- byte 0x03
//c:1 b:0 a:0 -- byte 0x04
//c:1 b:0 a:1 -- byte 0x05
//c:1 b:1 a:0 -- byte 0x06
//c:1 b:1 a:1 -- byte 0x07
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
float f;
double d;
char bs[65];
char b[65];
char s[80];
unsigned char *p;
char e[12];
char *t;
int ex;
while (1) {
printf("Input a float point number:");fflush(stdout);
rewind(stdin);
fgets(s,80,stdin);
if (1==sscanf(s,"%f",&f) && 1==sscanf(s,"%lf",&d)) break;
}
printf("f=%g\n",f);
p=(unsigned char *)&f;
printf("hex=%02X %02X %02X %02X\n",p[3],p[2],p[1],p[0]);
ltoa(*(long *)&f,b,2);
sprintf(bs,"%032s",b);
printf("bin=%s\n",bs);
printf("bin=%.1s %.8s %s\n",bs,bs+1,bs+9);
strncpy(e,bs+1,8);e[8]=0;
ex=strtol(e,&t,2);
printf(" %c %-4d-127 1.%s\n",(bs[0]=='0')?'+':'-',ex,bs+9);
ex-=127;
printf(" %c %-8d 1.%s\n",(bs[0]=='0')?'+':'-',ex,bs+9);
printf("\nd=%lg\n",d);
p=(unsigned char *)&d;
printf("hex=%02X %02X %02X %02X %02X %02X %02X %02X\n",p[7],p[6],p[5],p[4],p[3],p[2],p[1],p[0]);
_i64toa(*(__int64 *)&d,b,2);
sprintf(bs,"%064s",b);
printf("bin=%s\n",bs);
printf("bin=%.1s %.11s %s\n",bs,bs+1,bs+12);
strncpy(e,bs+1,11);e[11]=0;
ex=strtol(e,&t,2);
printf(" %c %-6d-1023 1.%s\n",(bs[0]=='0')?'+':'-',ex,bs+12);
ex-=1023;
printf(" %c %-11d 1.%s\n",(bs[0]=='0')?'+':'-',ex,bs+12);
return 0;
}
//Input a float point number:0.125
//f=0.125
//hex=3E 00 00 00
//bin=00111110000000000000000000000000
//bin=0 01111100 00000000000000000000000
// + 124 -127 1.00000000000000000000000
// + -3 1.00000000000000000000000
//
//d=0.125
//hex=3F C0 00 00 00 00 00 00
//bin=0011111111000000000000000000000000000000000000000000000000000000
//bin=0 01111111100 0000000000000000000000000000000000000000000000000000
// + 1020 -1023 1.0000000000000000000000000000000000000000000000000000
// + -3 1.0000000000000000000000000000000000000000000000000000
//
struct data
{
unsigned int num1;
unsigned int num2 ;
char ch1;
unsigned int num3;
unsigned int num4;
};
data a;
unsigned int *p_nNum1=&a.num1;
printf("%d ",p_nNum1,);