第八次作业

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
int main()
{
    int a, n;
    srand((unsigned)time(NULL));
    a = rand() % 100 + 1;
    printf("请输入你心里的所想的数：");
    scanf_s("%d", &n);
    while (n != a)
    {
        if (n > a)
        {
            printf("数字大，答案错误，请重新输入:");
            scanf_s("%d", &n);
        }
        else if (n = a)
            printf("回答正确，你写出的答案是%d,给的随机数为%d\n", n, a);
    }
}

 

 

#include <stdio.h>
int main() {
int i, j;
double sum1 = 0, sum2 = 0, sum = 0;
for (i = 1; i <= 99;)
{
sum1 += 1.0 / i;
i += 2;
}
for (j = 2; j <= 100;)
{
sum2 += 1.0 / j;
j += 2;
}
sum = sum1 - sum2;
printf("总和为:%f\n", sum);
return 0;
}

 

 

#include <stdio.h>
int main()
{
int i, j, k, a, sum = 0;
printf("请输入你想要加到的数:");
scanf_s("%d", &a);
for (i = 1; i <= a; i++)
{
for (j = 1; j <= i; j++)
{
sum += j;
}
}
printf("总和为%d", sum);
return 0;
}

 

 

#include <stdio.h>
int main()
{
    int i, a, b;
    printf("请输入一个正数:");
    scanf_s("%d", &a);
    while (a > 0)
    {
        b = a % 10;
        printf("%d\t", b);
        a /= 10;
    }
}

 

 

 

 

#include <stdio.h>
int main()
{
int i, j, k, sum;
for (i = 0; i < 33; i++)
{
for (j = 0; j < 50; j++)
{
k = 100 - i - j;
if (k % 2 != 0)
continue;
sum = 3 * i + 2 * j + k / 2;
if (sum == 100)
{
printf("´óÂí%d,ÖÐÂí%d,СÂí%d\n", i, j, k);
}
}
}
return 0;
}