查找字符在字符串中出现的次数：
int count1(char* str,char* s)
{
char* s1;
char* s2;
int count = 0;
while(*str!='\0')
{
s1 = str;
s2 = s;
while(*s2 == *s1&&(*s2!='\0')&&(*s1! ='0'))
{
s2++;
s1++;
}
if(*s2 == '\0')
count++;
str++;
}
return count;
}
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