实验3_c语言函数应用编程

task1

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<windows.h>
#define N 80

void print_text(int line, int col, char text[]);
void print_spaces(int n);
void print_blank_lines(int n);
int main()
{
    int line, col, i;
    char text[N] = "hi,November~";

    srand(time(0));

    for (i = 1; i <= 10; i++)
    {
        line = rand() % 25;
        col = rand() % 80;
        print_text(line, col, text);
        Sleep(1000);/*S大写*/
        return 0;
    }
}

/*打印n个空格*/
void print_spaces(int n)
{
    int i;

    for (i = 1; i <= n; ++i)
        printf(" ");
}

/*打印n行空白行*/
void print_blank_lines(int n)
{
    int i;
    for (i = 1; i <= n; ++i)
        printf("\n");
}

/*在第line行第col列打印一段文本*/
void print_text(int line, int col, char text[])
{
    print_blank_lines(line - 1);
    print_spaces(col - 1);
    printf("%s", text);
}
/*功能：随机在某行某列打印一个hi,November~*/

 功能：利用时间种子在随机行随机列打印“你好，十一月~”

task2

#include<stdio.h>
long long fac(int n);

int main()
{
    int i, n;

    printf("Enter n:");
    scanf("%d", &n);
    for (i = 1; i <= n; ++i)
        printf("%d!=%lld\n", i, fac(i));

    return 0;
}

long long fac(int n)
{
    static long long p = 1;
    printf("p=%lld\n", p);
    p = p * n;
    return p;
}

#include<stdio.h>
int func(int, int);

int main()
{
    int k = 4, m = 1, p1, p2;

    p1 = func(k, m);
    p2 = func(k, m);
    printf("%d,%d\n", p1, p2);

    return 0;
}

int func(int a, int b)
{
    static int m = 0, i = 2;

    i += m + 1;/*p1ʱ3  p2ʱ12*/
    m = i + a + b;/*p1ʱ8 p2ʱ17*/

    return m;
}

 运行结果与预期一致

task3

#include <stdio.h>
long long func(int n);

int main()
{
    int n;
    long long f;

    while (scanf("%d", &n) != EOF)
    {
        f = func(n);
        printf("n=%d,f=%lld\n", n, f);
    }

    return 0;
}

long long func(int n)
{
    long long s=1;
    if (n == 0)
        s=0;
    else if (n == 1)
        s=1;
    else if (n > 1)
        s = 2 * func(n - 1)+1;
    return s;
}

task4

#include <stdio.h>
int func(int n, int m);
int main() {
    int n, m;
    while (scanf("%d%d", &n, &m) != EOF)
        printf("n = %d, m = %d, ans = %d\n", n, m, func(n, m));
    return 0;
}

int func(int n, int m) {
    int sum1 = 1;
    int sum2 = 1;
    int sum3 = 1;

    int s = n - m;
    if (s < 0) {
        return 0;
    }

    for (n; n > 0; n--) {
        sum1 *= n;
    }

    for (m; m > 0; m--) {
        sum2 *= m;
    }

    for (s; s > 0; s--) {
        sum3 *= s;
    }

    int sum = sum1 / (sum2 * sum3);

    return sum;

}

#include <stdio.h>
int func(int n, int m);
int main() {
    int n, m;
    while (scanf("%d%d", &n, &m) != EOF)
        printf("n = %d, m = %d, ans = %d\n", n, m, func(n, m));
    return 0;
}

int func(int n, int m) {
    if (n < m) {
        return 0;
    }
    int sum;
    if (m == 0) {
        return 1;
    }
    if (n == 1 && m == 1) {
        sum = 1;
    }
    else if (m == 1) {
        sum = n;
    }
    else {
        sum = func(n - 1, m) + func(n - 1, m - 1);
    }

    return sum;
}

task5

#include<stdio.h>
#include<stdlib.h>
void hanoi(unsigned int n, char from, char temp, char to);
void moveplate(unsigned int n, char from, char to);
int main()
{
    unsigned int n;
    int step = 0;
    while (scanf("%u", &n) != EOF)
    {
        hanoi(n, 'A', 'B', 'C');
        for (; n > 0; n--)
            step = step * 2 + 1;
        printf("\n一共移动了%d次\n",step);
    }
    system("pause");
    return 0;
}

void hanoi(unsigned int n, char from, char temp, char to)
{
    if (n == 1)
        moveplate(n, from, to);
    else
    {
        hanoi(n - 1, from, to, temp);
        moveplate(n, from, to);
        hanoi(n - 1, temp, from, to);
    }
}
void moveplate(unsigned int n, char from, char to)
{
    printf("%u:%c-->%c\n", n, from, to);
}

task6

#include<stdio.h>
#include<math.h>
long func(long s);

int main()
{
    long s, t;

    printf("Enter a number:");
    while (scanf("%ld", &s) != EOF) {
        t = func(s);
        t = func(t);
        printf("new number is:%ld\n\n", t);
        printf("Enter a number:");
    }
    return 0;
}

long func(long s)
{
    int t, result=0;
    while (s > 0)
    {
        t = s % 10;
        if (t % 2 != 0)
        {
            result = result*10 + t;
        }
        s = s / 10;
    }
    return result;
}