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首先你要理解什么是格式符，C語言中常用的格式符有哪些?

例：%s字符串 %d十進制數(shù)字 %\p地址 %f浮點數(shù)

在printf里格式化輸出是要一個變量替換的作用，舉例如下

int?main(){
????int?num?=?20;
????float?flo?=?13.5;?
????char?str[30]?=?"my?name?is?frind";
????printf("%d,%f,%s",num,flo,str);?
}
輸出為:20?13.5?my?name?is?frind

不一定啊，比如：

????#include<stdio.h>
????{
????????void?main()
????????{
????????????printf("Hello?World!!");
????????}
????}

這里就沒有用格式符。