实验1
任务一
#include <stdio.h> int main() { printf(" O \n"); printf("<H>\n"); printf("I I\n"); printf(" O \n"); printf("<H>\n"); printf("I I\n"); return 0; }
#include <stdio.h> int main() { printf(" O 0 \n"); printf("<H> <H>\n"); printf("I I I I\n"); return 0; }
任务二
#include <stdio.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); return 0; }
#include <stdio.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); return 0; }
原因:两个整数相除,所得商仍为整数,舍去小数部分。
任务三
#include <stdio.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", n); printf("r1 = %d\n", r1); printf("r2 = %d\n", r2); printf("r3 = %d\n", r3); printf("r4 = %d\n", r4); return 0; }
#include <stdio.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", n); printf("r1 = %d\n", r1); printf("r2 = %d\n", r2); printf("r3 = %d\n", r3); printf("r4 = %d\n", r4); return 0; }
7:先n*(n+1),然后/2
8: 先n*(n+1),然后/2
9: 先n/2,然后*(n+1)
10: 先(n+1)/2,然后*n
原因:101/2=50
任务四
#define _CRT_SECURE_NO_WARNINGS #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); 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; }
任务五
#define _CRT_SECURE_NO_WARNINGS #include <stdio.h> int main() { int a1, a2; char c1, c2; 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; }
任务六
#define _CRT_SECURE_NO_WARNINGS #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("无所谓,无论线上线下都差不多.\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("遇到问题,寻求老师和同学的帮助。\n"); getchar(); gets_s(words); } return 0; }
实验总结:我知道了VS里遇到不安全警告的处理方法和gets未定义标识符的处理方法。