关于一下
char * pChar;
if(NULL==(pChar=(char *)malloc(siziof(char)*200)))printf("malloc error\n")
memset((void*)pChar,0,200);//把200个字节内容清零
print("pChar[0]=%c",pChar[0]);
i=(pChar[0]==0;)printf("~~~%ld\n",i);
pChar[0]=1;
print("pChar[0]=%c",pChar[0]);
i=(pChar[0]==0;)printf("~~~%ld\n",i);
pChar[0]=48;
print("pChar[0]=%c",pChar[0]);
i=(pChar[0]==0;)printf("~~~%ld\n",i);
其实*pChar的内容置0，其实就是置为串尾符。
执行结果是：
由上面的结果也可以看出pChar=0其实是赋值NULL。清空
pChar=0,或者pChar=1,进行时直接的acsii值表的赋值。直接查国际Ascii表就可以知道结果了。比如数字0对应的ascii表值为48，则：
print("pChar[0]=%c",pChar[0]);的结果和ASCII码表相对应。故pChar[0]=48;则print("pChar[0]=%c",pChar[0]);打印的结果pChar[0]=0
故可以有如下操作
...
i=**;
if(pChar[i]==0)pChar[i]=1;
...
即虽然pChar[i]为char类型，但是可以直接赋值0,1.即按照ACSII码表来赋值
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