C language | Use getchar to read two characters, respectively use putchar and printf to output

Example 48: Write a program, use the getchar function to read two characters into c1 and c2, and then use the putchar function and printf function to output the two characters.

Problem-solving ideas: think about three questions

Should the variables c1 and c2 be defined as character or integer?
What should I do if I want to output the ASCII codes of the c1 and c2 values?
Do integer variables and character variables replace each other under any circumstances?

Source code demo:

#include<stdio.h>//头文件 
int main()//主函数 
{
    
    
  char character_1,character_2;//定义字符 
  printf("请输入两个字符；\n");//提示语句 
  character_1=getchar();//键盘输入字符character_1
  character_2=getchar();//键盘输入字符character_2 
  printf("用putchar语句输出结果为：");//提示语句 
  putchar(character_1);//输出字符character_1 
  putchar(character_2);//输出字符character_2 
  printf("\n");
  printf("--------------\n");//分隔符号 
  printf("用printf语句输出结果为：\n");//提示语句 
  printf("%c\n",character_1);//输出字符character_1 
  printf("%c\n",character_2);//输出字符character_2 
  return 0;//主函数返回值为0 
}

The compilation and running results are as follows:

请输入两个字符；
xy
用putchar语句输出结果为：xy
--------------
用printf语句输出结果为：
x
y

--------------------------------
Process exited after 5.082 seconds with return value 0
请按任意键继续. . .

C language uses getchar to read in two characters, and respectively uses putchar and printf to output

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