experiment1

#include <stdio.h>
int main()
{
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");
    
    return 0;
}

#include<stdio.h>
int main()
{
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");
    printf(" o \n");
    printf("<H>\n");
    printf("I I\n");
    return 0;
    } 

#include<stdio.h>
int main()
{
    printf(" o    o\n");
    printf("<H>  <H>\n");
    printf("I I  I I\n");
    
    return 0;
    } 

task2

int main()
{
    int n,sum;
    
    printf("从键盘上输入一个十进制整数给n\n:");
    scanf("%d",&n);
    
    sum = n*(n+1)/2;
    printf("sum = %d\n",sum);
    
    return 0;    
    
}

写法三四不可行，会造成精度损失

task3

#include <stdio.h>

int main()
{
    int a, b, t;
    
    a = 3;
    b = 4;
    printf("a =%d, b = %d\n", a, b);
    
    t = a;
    a = b;
    b = t;
    printf("a = %d, b = %d\n", a, b);
    
    return 0;
}

使ab的值实现交换

task4

#include <stdio.h>
int main()
{
  int x, t, m;
  
  x = 123;
  printf("x = %d\n", x);
  
  t = 0;
  
  m = x % 10;
  t = t *10 + m;
  x = x / 10;
  
  m = x % 10;
  t = t * 10 + m;
  x = x / 10;
  
  m = x % 10;
  t = t * 10 + m;
  x = x / 10;
  
  printf("t = %d\n", t);
  
  return 0;
}

使数据位置得到颠倒

task5

#include <stdio.h>

int main()
{
  float a, b, c;

  scanf("%f%f%f", &a, &b, &c);

  if(a+b>c && a-b<c)
  printf("能构成三角形\n");
  else
  printf("不能构成三角形\n");
  
  return 0;
}

task6

int main()
{
    int year;
    
    year = 1000000000/60/60/24/365;
    
    printf("10亿秒约等于%d年\n",year);
    
    return 0;
 } 

task7

#include<stdio.h>
#include<stdlib.h>

int main()
{
    int n;
    
    n=rand()%41+60;
     
    printf("n=%d\n",n);
    
    return 0;
 } 

task8

#include <stdio.h>>
int main()
{
    char ans1, ans2;
    printf("每次课前认真预习、课后及时复习了没? (输入y或Y表示有，输入n或N表示没有) : ");
    ans1 = getchar();
    
    getchar(); 
    
    printf("\n动手敲代码实践了没? (输入y或Y表示敲了，输入n或N表示木有敲) : ");
    ans2 = getchar();
    
    if ((ans1=='Y'&&ans2=='Y')) 
    printf("\n罗马不是一天建成的, 继续保持哦:)\n");
    else
    printf("\n罗马不是一天毁灭的, 我们来建设吧\n");

    return 0;
}