实践一

试验任务一
#include<stdio.h>
#include<stdlib.h>
int main()
{
    printf("o \n");
    printf("<H>\n");
    printf("I I\n");

    system("pause");

    return 0;
}

试验任务2
#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n,sum;
    scanf("%d", &n);
    sum=n*(n+1)/2;
    printf("sum = %d\n", sum);

 

    system("pause");

    return 0;
}

#include<stdio.h>
#include<stdlib.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, a);

    system("pause");

    return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
    intx, 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);

    system("pause");

    return 0;
}

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

    system("pause");

    return 0;
}

 

 

 

#include<stdio.h>
#include<stdlib.h>
int main()
{
    float a, b, c;

    scanf("%f%f%f", &a, &b, &c);
    if (a+b>c && abs(a-b)<c)
        printf("能构成三角形\n");
    else
        printf("不能构成三角形\n");

    system("pause");

    return 0;
}

 

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int year;
    year = 10^9 / 60 / 60 / 24 / 365;

    printf("十亿秒约等于%d\n", year);


    system("pause");

    return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int n;

    n = rand() % 41 + 60;

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

    system("pause");

    return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
    char ans1, ans2;
    
    printf("课前预习了吗？（输入Y或者y表示有，输入N或者n表没有）");
    ans1 = getchar();
    
    getchar();

    printf("\n动手实践了吗？（输入Y或者y表示有，输入N或者n表没有）");
    ans2 = getchar();

    if ((ans1=='Y'||ans1=='y')&&(ans2=='Y'| ans2=='y'))
        printf("\n罗马不是一天建成的\n");
    else
        printf("\n罗马不是一天毁灭的\n");

    system("pause");

    return 0;
}