注释是对代码的“提示”，而不是文档

 1 #include <iostream>
 2 #include<stdlib.h>
 3 
 4 /* run this program using the console pauser or add your own getch, system("pause") or input loop */
 5 using namespace std;
 6 int main(int argc, char** argv) {
 7         //声明变量
 8     char ch;
 9     char str[20];
10     int n;
11     float x;
12 
13     //用stdin从键盘上输入数据
14     fprintf(stdout,"ch str\n");
15     fscanf(stdin,"%c %s",&ch,str);
16     fprintf(stdout,"n    x \n");
17     fscanf(stdin,"%d  %f",&n,&x);
18     cout<<"----------------"<<endl;
19 
20     //输出显示
21     fprintf(stdout,"ch=%c str=%s",ch,str);
22     fprintf(stdout,"\nn=%d x=%f",n,x);
23     cout<<endl;
24     return 0;
25 }