C语言printf（）函数的格式化字符串

原文链接：
https://www.runoob.com/cprogramming/c-function-printf.html

#include<stdio.h>
#include<string.h>
int main(void)
{
    charc,s[20],*p;
    inta=1234,*i;
    floatf=3.141592653589;
    doublex=0.12345678987654321;
    p="Howdoyoudo";
    strcpy(s,"Hello,Comrade");
    *i=12;
    c='\x41';
    printf("a=%d\n",a);       /*结果输出十进制整数a=1234*/
    printf("a=%6d\n",a);      /*结果输出6位十进制数a=1234*/
    printf("a=%06d\n",a);     /*结果输出6位十进制数a=001234*/
    printf("a=%2d\n",a);      /*a超过2位,按实际值输出a=1234*/
    printf("*i=%4d\n",*i);    /*输出4位十进制整数*i=12*/
    printf("*i=%-4d\n",*i);   /*输出左对齐4位十进制整数*i=12*/
    printf("i=%p\n",i);       /*输出地址i=06E4*/
    printf("f=%f\n",f);       /*输出浮点数f=3.141593*/
    printf("f=%6.4f\n",f);    /*输出6位其中小数点后4位的浮点数
    f=3.1416*/
    printf("x=%lf\n",x);      /*输出长浮点数x=0.123457*/
    printf("x=%18.16lf\n",x); /*输出18位其中小数点后16位的长浮点数x=0.1234567898765432*/
    printf("c=%c\n",c);       /*输出字符c=A*/
    printf("c=%x\n",c);       /*输出字符的ASCII码值c=41*/
    printf("s[]=%s\n",s);     /*输出数组字符串s[]=Hello,Comrade*/
    printf("s[]=%6.9s\n",s);  /*输出最多9个字符的字符串s[]=Hello,Co*/
    printf("s=%p\n",s);       /*输出数组字符串首字符地址s=FFBE*/
    printf("*p=%s\n",p);      /*输出指针字符串p=Howdoyoudo*/
    printf("p=%p\n",p);       /*输出指针的值p=0194*/
    getch();
    return 0;
}