字符转换BCD码

[mervyn832538]

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>

void Asc2Bcd( bcd, asc, len, align )
unsigned char *bcd;
unsigned char *asc;
int len;
char align;
{
int i, flag = 0;
unsigned char ch;

memset(bcd, 0, (len + 1) / 2);

if ((len % 2) && align) flag = 1;

for (i = 0; i < len; i++) {
if (asc[i] >= 'a') ch = asc[i] - 'a' + 10;
else if (asc[i] >= 'A') ch = asc[i] - 'A' + 10;
else if (asc[i] >= '0') ch = asc[i] - '0';
else ch = 0;
if ((i + flag) % 2) bcd[(i + flag) / 2] |= (ch & 0x0F);
else bcd[(i + flag) / 2] |= (ch << 4);
}
}

int main()
{

unsigned char *bc;
const char *ac="12";
printf("__n_n__\n");
Asc2Bcd(bc,ac,16,0);
printf("__L_L__\n");
printf("__L_L__%s\n",ac);
}
在linux 系统环境中 编译没有错误，执行之后提示 段错误 (core dumped) ？？？？为什么呢。

[赵4老师]

仅供参考

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
unsigned int iv,i;
unsigned char BCD[5];//定长10位BCD码
unsigned char sv[11];
void main() {
    iv=123456789;//最大10位无符号正整数
    //INT2BCD
    sprintf(sv,"%010u",iv);
    for (i=0;i<10;i+=2) {
        BCD[i/2]=(sv[i]<<4)|(sv[i+1]&0x0F);
    }
    printf("BCD=%02x%02x%02x%02x%02x\n",BCD[0],BCD[1],BCD[2],BCD[3],BCD[4]);
    //BCD2INT
    for (i=0;i<10;i+=2) {
        sv[i]='0'|(BCD[i/2]>>4);
        sv[i+1]='0'|(BCD[i/2]&0x0F);
    }
    sscanf(sv,"%010u",&iv);
    printf("iv=%010u\n",iv);
    getch();
}

[Rainqin123]

[Quote=引用 1 楼 zhao4zhong1 的回复:]
仅供参考

C/C++ code
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
unsigned int iv,i;
unsigned char BCD[5];//定长10位BCD码
unsigned char sv[11];
void main() {
iv=123456789;//最大10位无符号……
[/Quote]



赵兄C语言学得不错

[justkk]

内存的问题
unsigned char *bc; // 没有分配空间
const char *ac="12"; // 指针指向只读区域了

[MIFI007]

学习ing