实验1 C语言开发环境使用和编程初体验
1.实验任务1
1)
#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; }
2)
#include<stdio.h> int main() { printf(" o o\n"); printf("<H> <H>\n"); printf("I I I I\n"); return 0; }
2.实验任务2
#include<stdio.h> #include<stdlib.h> int main() { int n, sum; scanf_s("%d",&n); sum = n*(n+1)/2; printf("sum = %d\n",sum); system("pause"); return 0; }
问题:
写法3,4不能满足,会使奇数除以2,小数取整
3.实验任务3
#include<stdio.h> int main() { int a, b, t; a = 3; b = 4; printf("a = %d, b = %d\n", a, b); t = a; a = b; b = t; printf("a = %d, b = %d\n", a, b); return 0; }
问题:
用t充当中间量,替换a,b
4.实验任务4
#include<stdio.h> int main() { int x, t, m; x = 123; printf("x = %d\n", x); t = 0; m = x % 10; t = t * 10 + m; x = x / 10; m = x % 10; t = t * 10 + m; x = x / 10; m = x % 10; t = t * 10 + m; x = x / 10; printf("t = %d\n", t); return 0; }
问题:
将x个位,十位,百位的数字单个取出,进行相关运算使数字颠倒顺序。
5.实验任务5
#include<stdio.h> int main() { float a, b, c; printf("输入三边长:\n"); scanf_s("%f %f %f", &a, &b, &c); if((a + b > c) && (a + c > b) && (b + c > a)) printf("能构成三角形\n"); else printf("不能构成三角形\n"); return 0; }
6.实验任务6
#include<stdio.h> int main() { int year; int s = 1e9; year=s/60/60/24/365; printf("10亿秒等于%d年\n", year); return 0; }
7.实验任务7
#include<stdio.h> #include<stdlib.h> #include<time.h> int main() { int n; srand((unsigned)time(NULL)); n = rand() % 40 + 1 + 60; printf("n = %d\n", n); return 0; }
8.实验任务8
#include<stdio.h> int main() { char ans1, ans2; printf("每次课前认真预习、课后及时复习了没?(输入y或Y表示有,输入n或N表示没有):"); ans1 = getchar(); getchar(); printf("\n动手敲代码实践了没?(输入y或Y表示敲了,输入n或N表示没有敲):"); ans2 = getchar(); if ((ans1 == 'y' || ans1 == 'Y') && (ans2 == 'y' || ans2 == 'Y')) printf("\n罗马不是一天建成的,继续保持\n"); else printf("\n罗马不是一天毁灭的,我们来建设吧\n"); return 0; }