本帖最后由 xiaojuan 于 2014-9-24 22:38 编辑
//:Vc++6.0 String strspn函数
//功能：找到目标中出现的字符的个数
//参数：str1 字符串1 str2 字符串2
//返回值：返回查找到的个数
#include<stdio.h>
int strspn(const char *str1, const char *str2);
int main()
{
int i;
char strtext[] = "129th";
char cset[] = "1234567890";
i = strspn (strtext,cset);
printf ("The length of initial number is %d.\n",i);
return 0;
}
int strspn(const char *str1, const char *str2)
{
if (str1 == NULL || str2 == NULL)
{
perror("str1 or str2");
return -1;
}
int count = 0;
const char *temp1 = str1;
const char *temp2 = str2;
while (*temp1 != '\0')
{
temp2 = str2; //将str2 指针从新指向在字符串的首地址
while (*temp2 != '\0')
{
if (*temp2 == *temp1)
count++;
temp2++;
}
temp1++;
}
return count;
}
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