实验任务1
源码
#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, April~";
srand(time(0));
for(i = 1; i <= 10; ++i) {
line = rand() % 25;
col = rand() % 80;
print_text(line, col, text);
Sleep(1000);
} return 0;}
void print_spaces(int n) {
int i;
for(i = 1; i <= n; ++i)
printf(" ");
}
void print_blank_lines(int n) {
int i;
for(i = 1; i <= n; ++i)
printf("\n");
}
void print_text(int line, int col, char text[]) {
print_blank_lines(line-1);
print_spaces(col-1);
printf("%s", text);
}
实验任务2_1
源码
#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;
p = p * n;
printf("p = %lld\n", p);
return p;
}
屏幕截图
实验任务2_2
源码
#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;
m = i+ a + b;
return m;
}
屏幕截图
static变量只能被所在的源文件使用
实验任务3
源码
#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;
if (n == 1)
s = 1;
else
s = 2 * func(n - 1) + 1;
return s;
}
屏幕截图
实验4
源码
#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 || m == 0) {
return 1;
}
else if (n < m) {
return 0;
}
return func(n - 1, m) + func(n - 1, m - 1);
}
屏幕截图
实验5-1
源码
#include <stdio.h>
double mypow(int x, int y);
int main()
{
int x, y;
double ans;
while (scanf("%d%d", &x, &y) != EOF)
{
ans = mypow(x, y);
printf("%d的%d次方: %g\n\n", x, y, ans);
}
return 0;
}
double mypow(int x, int y)
{
int i;
double ans = 1.0;
if (y >= 0)
{
for (i = 1;i <= y;i++)
ans = ans * x;
return ans;
}
else
{
for (i = 1;(i + y) <= 0;i++)
ans = ans / x;
return ans;
}
}
屏幕截图
5-2
源码
#include <stdio.h>
double mypow(int x, int y);
int main() {
int x, y;
double ans;
while (scanf("%d %d", &x, &y) != EOF) {
ans = mypow(x, y);
printf("%d的%d次方：%g\n\n", x, y, ans);
}
return 0;
}
double mypow(int x, int y) {
if (y == 0)
return 1;
if (y > 0)
return x * mypow(x, y - 1);
if (y < 0)
return 1.0 / x * mypow(x, y + 1);
}
屏幕截图
实验6
源码
#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 t;
int main() {
unsigned int n;
while (scanf("%u", &n) != EOF) {
t = 0;
hanoi(n, 'A', 'B', 'C');
printf("一共移动了%d次\n", t);
}
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) {
t = t + 1;
printf("%u: %c --> %c\n", n, from, to);
}
屏幕截图
实验7
源码
#include<stdio.h>
int is_prime(int n);
int main()
{
int n, i;
for (n = 4;n <= 20;n += 2)
{
for (i = 2;i <= (n / 2);i++)
{
if (is_prime(i) && is_prime(n - i))
{
printf("%d = %d + %d\n", n, i, n - i);
break;
}
}
}
return 0;
}
int is_prime(int n)
{
int i, flag = 1;
for (i = 2;i < n;i++)
{
if (n % i == 0)
flag = 0;
}
return flag;
}
屏幕截图
实验8
源码
#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);
printf("new number is: %ld\n\n", t);
printf("Enter a number: ");
}
return 0;
}
long func(long s)
{
long ans = 0;
long x, i = 1;
while (s != 0)
{
x = s % 10, s = s / 10;
if (x % 2 != 0)
{
ans = ans + x * i;
i = i * 10;
}
}
return ans;
}
屏幕截图
