sprintf && sscanf

sprintf
作用：格式化字符串

char buf[128]; //或者动态分配内存 char* buf = (char*)malloc(128);
sprintf(buf, "name:%s, age:%d", "haocan_xu", 25); //运行结果为buf的内容是 name:haocan_xu, age:25

sscanf
作用：解析字符串（ps：sscanf只适用于提取数字，不能提取字符串）

const char* text = "2018-7-6";
int year, month, day;
int n = sscanf(text, "%d-%d-%d", &year, &month, &day); //n=3, sscanf的返回值为提取出的段落数量，例如char* text = "2018-7-"，则n=2