C中的字符比较？

Question

I am trying the following code to try to find whether there is a comma followed by a semicolon in a char array. Here is my code

char m[80];
char *p = m;

while(p!=pend)
{
    char *pend = m + strlen(m);  
    int i=0;

    if(*p!=',' || *p!=';')
    {
        printf("DDD");
        char temp[2];
        temp[0] = *p;
        temp[1] = '\0';
        strcat( m2, temp );
    }
    else if(*p==',' && (*(p+1)==';'))
    {
        printf("CCC");
        char temp[2];
        temp[0] = *p;
        temp[1] = '\0';
        strcat( m2, temp );
    }
}

But the problem is, eve though input is, for example 12,;3 it never enters "else if" part. What can i do about it?

Thank you

Answer 1

它不会进入else部分，因为if部分始终求值为true（ 任何字符都不等于','或';' ）。

Answer 2

if(*p!=',' || *p!=';')

will always be true ( *p can't be both ',' and ';' ). Since the first if is always true, the following else if is never evaluated.

I'm not sure what you're trying to do with the first if block. Maybe the simplest 'fix' would be to just delete that part of your code.