task1.c
#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); } 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); }
功能:在25行/80列的空间里任意位置处打印出"hi, November~",停留一秒,在下一个25行/80列的空间里重复上述操作,如此共重复10次。
task2_1.c
#include <stdio.h> long long fac(int n); int main() { int i, n; printf("Enter n: "); scanf_s("%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; return p; }
task2_2.c
#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; }
局部变量static的特性:能将static所在的函数运行一次后的结果保留,并用于下一次函数的运行。
task3.c
#include <stdio.h> long long func(int n); int main() { int n; long long f; while (scanf_s("%d", &n) != EOF) { f = func(n); printf("n = %d, f = %lld\n", n, f); } return 0; } long long func(int n) { double result; if (n == 1) result = 1; else result = 2 * func(n - 1) + 1; return result; }
task4.c
#include <stdio.h> int func(int n, int m); int main() { int n, m; while (scanf_s("%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 result; if (n == m || m == 0) result = 1; else if (n < m) result = 0; else result = func(n - 1, m) + func(n - 1, m - 1); return result; }
task5.c
#include <stdio.h> #include<stdlib.h> int mul(int n, int m); int main() { int n, m; while (scanf_s("%d%d", &n, &m) != EOF) printf("%d * %d = %d\n", n, m, mul(n, m)); return 0; } int mul(int n, int m) { int result; if (n == 0 || m == 0) { result = 0; } else if (n > m) { result = mul(n, m - 1) + n; } else { result = mul(n - 1, m) + m; } return result; }
task6.c
#include< stdio.h> #include<stdlib.h> #include<math.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 m; while (scanf_s(" %u", &n) != EOF) { hanoi(n, 'A', 'B', 'C'); m = pow(2, n) - 1; printf("一共移动了%d次.\n", m); 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); }
task7.c
#include< stdio.h> #include<stdlib.h> #include<math.h> int is_prime(int n); int main() { int m; while (scanf_s("%d", &m) != EOF) is_prime(m); return 0; } int is_prime(int n) { int i, p_flag, q_flag,p,q; if ((n % 2 == 1) || n < 4) { printf("数据输入错误\n"); exit (0); } p = 1; do { p += 1; q = n - p; p_flag = 1; for (i = 2; i <= sqrt(1.0 * p); i++) { if (p % i == 0) { p_flag = 0; break; } } q_flag = 1; for (i = 2; i <= sqrt(1.0 * q); i++) { if (q % i == 0) { q_flag = 0; break; } } } while (p_flag * q_flag == 0); printf("%d = %d + %d", n, p, q); }
task8.c
#include <stdio.h> long fun(long s); int main() { long s, t; printf("Enter a number: "); while (scanf_s("%ld", &s) != EOF) { t = fun(s); printf("new number is: %ld\n\n", t); printf("Enter a number: "); } return 0; } long fun(long s) { long n, result = 0; int m = 1; while (s > 0) { n = s % 10; if (n % 2 != 0) { result += n * m; m *= 10; } s = s / 10; } return result; }
标签:return,int,long,实验,result,func,include From: https://www.cnblogs.com/wangrongxin240/p/16861399.html