strchr()
查找字符串s中首次出现字符c的位置
char * my_strchr(char *str1, char str2)
{while (*str1 != str2 && *str1 != NULL){str1++;}return str1;
}int main()
{char string[17];char *ptr, c = 'r';strcpy(string, "Thisisastring");ptr = my_strchr(string, c);if (ptr)printf("The character %cis at position:%s\n", c, ptr);elseprintf("The character was not found\n");system("pause");return 0;
}
)
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![使用虚拟环境virtualenv 创建虚拟环境出现PermissionError: [Errno 13] Permission denied:](http://pic.xiahunao.cn/使用虚拟环境virtualenv 创建虚拟环境出现PermissionError: [Errno 13] Permission denied:)
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