Printf函数格式输出语句

• printf输出语句，用来向终端输出数据
  1.printf("hollow world");//输出单词hollow world
  2.输出数据时，
  printf("%d",变量)；运行后显示一个整数
  printf("真正金额为%d"，变量)；运行后显示“真正金额为多少”
  printf("%2d",变量)；输出两位数字
  printf("%.2f",变量)；输出两位小数

Scanf函数格式化输入语句

• scanf输入语句，用于向终端输入数据
  1.scanf("%d",&变量)；输入一个数据，&为取址符号
  2.scanf("Jake %d",&变量)；先输Jake，紧跟着输数字；
  用户输入的格式
  3.scanf("%d",变量1)；scanf("%d",变量2)；应当输入“数字1（空格）数字2”空格为缓冲区

#include<stdio.h>

int main (){

    int count = 0;
    count = 3;
    printf("i have %02d a dogs\n",count);
    long size = 230;
    printf("%ld\n",size);
    float score = 3.1415926;
    printf("%.2f\n",score);
    char choose = 'c';
    printf("%c\n",choose) ;
    printf("%d\n",choose); 
    bool status = 3;//false
    printf("%d\n",status);
     int pwd = 0;
     scanf("jack%d",&pwd);
     printf("pwd = %d\n,pwd);
     int num1,num2;
     scanf("%d %d",&num1,&num2) ;
    printf("%d %d\n",num1,num2);

    return 0

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