实验作业

1.1

#include <stdio.h>
#include <stdlib.h>
int main()
{
    printf(" 0\t 0\n");
    printf("<H>\t<H>\n");
    printf("I I\tI I\n");
    system("pause");
    return 0;
}

1.2

 

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

 

 2.1

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int x, y;
    int r1, r2, r3, r4;

    x = 1;
    y = 2;

    r1 = x + y;
    r2 = x - y;
    r3 = x * y;
    r4 = x / y;

    printf("r1=%d\n",r1);
    printf("r2=%d\n",r2);
    printf("r3=%d\n",r3);
    printf("r4=%d\n", r4);
    system("pause");
    return 0;
}

 

 2.2

#include <stdio.h>
#include<stdlib.h>
int main()
{
    float x, y;
    float r1, r2, r3, r4;

    x = 1;
    y = 2;

    r1 = x + y;
    r2 = x - y;
    r3 = x * y;
    r4 = x / y;

    printf("r1=%f\n",r1);
    printf("r2=%f\n",r2);
    printf("r3=%f\n",r3);
    printf("r4=%f\n", r4);
    system("pause");
    return 0;
}

 

3.1

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int n,r1, r2, r3, r4;

    n = 100;

    r1 = n*(n+1)/2;
    r2 = (n+1)*n/2;
    r3 = n/2*(n+1);
    r4 = (n+1)/2* n;

    printf("n=%d\n");
    printf("r1=%d\n",r1);
    printf("r2=%d\n",r2);
    printf("r3=%d\n",r3);
    printf("r4=%d\n", r4);
    system("pause");
    return 0;
}

 

 3.2

#include <stdio.h>
#include<stdlib.h>
int main()
{
    int n,r1, r2, r3, r4;

    n = 100;

    r1 = n*(n+1)/2;
    r2 = (n+1)*n/2;
    r3 = n/2*(n+1);
    r4 = (n+1)/2* n;

    printf("n=%d\n");
    printf("r1=%d\n",r1);
    printf("r2=%d\n",r2);
    printf("r3=%d\n",r3);
    printf("r4=%d\n", r4);
    system("pause");
    return 0;
}
#include <stdio.h>
#include<stdlib.h>
int main()
{
    int n,r1, r2, r3, r4;

    n = 101;

    r1 = n*(n+1)/2;
    r2 = (n+1)*n/2;
    r3 = n/2*(n+1);
    r4 = (n+1)/2* n;

    printf("n=%d\n");
    printf("r1=%d\n",r1);
    printf("r2=%d\n",r2);
    printf("r3=%d\n",r3);
    printf("r4=%d\n", r4);
    system("pause");
    return 0;
}

 

r3,r4都会出现不精确的问题

4.1

#include<stdio.h>
int main()
{
double x, y;
char c1, c2, c3;
int a1, a2, a3;
scanf("%d%d%d", &a1, & a2, &a3);
printf("%d,%d,%d\n", a1, a2, a3);
getchar();
scanf("%c%c%c", &c1, &c2, &c3);
printf("%c,%c,%c\n", c1, c2, c3);
scanf("%lf%lf", &x, &y);
printf("%lf,%lf\n", x, y);
return 0;
}

 

5.1

#include <stdio.h>
int main()
{
char c1, c2;
int a1, a2;
scanf("%d%c%d%c", &a1, &c1, &a2, &c2);
printf("a1 = %d,a2 = %d\n", a1, a2);
printf("c1 = %c,c2 = %c\n", c1, c2);
return 0;
}

6.1

 

#include <stdio.h>
int main() {
int answer;
char words[5000];
printf("网课学习让一些人欢喜一些人忧.\n");
printf("1. 作为一个宅，社恐，觉得这样很好. 有网络，自主学习，很ok.\n");
printf("2. 不喜，不喜，很不喜. 眼睛快瞎了. 脑壳有点卡...\n");
printf("3. 中间派. 不知道. 说不清.\n");
printf("4. 其它...\n");
printf("你的选择: ");
scanf("%d", &answer);
if (answer == 4) {
printf("请补充说明你的想法: \n");
getchar(); 
gets_s(words); 
}
printf("\n"); 
printf("当遇到问题时, 你会选择:\n");
printf("1. 遇到问题, 就解决问题。不懂的，搜索式学习，逐个攻破.\n");
printf("2. 遇到问题, 不高兴。然后,...,没有了.\n");
printf("3. 其它...\n");
printf("你的选择: ");
scanf("%d", &answer);
if (answer == 1)
printf(":)\n");
else if (answer == 2)
printf("这样不能解决问题啊...我们选择1好不好:)\n");
else if (answer == 3) {
printf("请补充说明你的想法: \n");
getchar(); 
gets_s(words);
}
return 0;
}