实验一

任务1

1.1

#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;
 } 

1.2

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

 任务2

#include<stdio.h>

int main()
{
    int n,sum;  
    
    scanf("%d", &n);
    
    sum =(n+1)*n/2;
    
    printf("sum=%d\n",sum);    
    
    return 0;
}

任务3

#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;
}

任务4

#include<stdio.h>

int main()
{
int x, t, m;
x = 456;
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;
}

任务5

#include<stdio.h>

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

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


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

任务6

#include<stdio.h>

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

任务7

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

int main()
{
    srand(time(0));

    int n = rand() % 41 + 60;

    printf("n=%d\n", n);

    return 0;
}

任务8

#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;
}