//p1改错
#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;
}
//p2验证三角形,没有问题
#include <stdio.h>
int main() {
double a,b,c;
scanf("%lf %lf %lf", &a, &b, &c);
if(a<0 || b<0 || c<0)
printf("不能构成三角形\n");
else if(a+b>c && a+c>b && b+c>a)
{
if(a==b || a==c || b==c)
{
if (a==b && a==c)
printf("构成等边三角形\n");
else
printf("构成等腰三角形\n");
}
else
printf("构成一般三角形\n");
}
else
printf("不能构成三角形\n");
return 0;
}
//p2 char变int
#include <stdio.h>
#include <stdlib.h>
int main() {
int choice;
// 显示菜单
printf("输入0~9以内的数字,选择屏幕背景色前景色方案: \n");
printf("1-\t黑底绿色\n");
printf("2-\t白底黑色\n");
printf("3-\t蓝底白色\n");
printf("其它-\t黑底白色(默认)\n");
printf("\n请输入, 选择你想使用的屏幕配色方案: ");
// 要求用户从键盘输入0~9的数字,选择屏幕配色方案
scanf("%d",&choice);
// 根据用户输入,设置屏幕配色方案
if (choice == 1) {
system("color 02");
printf("《黑客帝国》一类的影视剧常见这种屏幕色:)\n");
}
else if(choice == 2) {
system("color f0");
printf("大部分编辑器默认是这种配色:)\n");
}
else if(choice == 3) {
system("color 1f");
printf("这是机器蓝屏故障时的不讨喜色:)\n");
}
else {
system("color 0f");
printf("控制台程序默认小黑窗:)\n");
}
printf("programming is fun, just try@_@\n");
return 0;
}
//p3练习1
#include<stdio.h>
int main(){
int a ;
printf("请输入一个三为以内的十进制整数:");
scanf("%d",&a);
printf("计算其逆序数...\n");
if (a>=0&&a<=9)
printf("%d正序和逆序相同\n",a);
else if(a>=10&&a<=99){
if(a/10==a-a/10*10)
printf("%d正序和逆序相同\n",a);
else
printf("%d正序和逆序不同\n",a);
}
else{
if(a/100==a%10)
printf("%d正序和逆序相同\n",a);
else
printf("%d正序和逆序不同\n",a);
}
return 0;
}
p3练习2
# include<stdio.h>
# include<stdlib.h>
int main(){
int year,month,day;
printf("请输入年份 月份:\n");
scanf("%d %d",&year,&month);
if(year<1||month<1||month>12)
{
printf("输入数据有误。\n");
exit(0);
}
if(year%100==0)
{
if(year%400==0)
{if(month==1)
printf("%d年%d月是31天",year,month);
else if(month==3)
printf("%d年%d月是31天",year,month);
else if(month==5)
printf("%d年%d月是31天",year,month);
else if(month==7)
printf("%d年%d月是31天",year,month);
else if(month==8)
printf("%d年%d月是31天",year,month);
else if(month==10)
printf("%d年%d月是31天",year,month);
else if(month==12)
printf("%d年%d月是31天",year,month);
else if(month==2)
printf("%d年%d月是29天",year,month);
else if(month==4)
printf("%d年%d月是30天",year,month);
else if(month==6)
printf("%d年%d月是30天",year,month);
else if(month==9)
printf("%d年%d月是30天",year,month);
else if(month==11)
printf("%d年%d月是30天",year,month);
}
}
else if(year%4==0)
{if(month==1)
printf("%d年%d月是31天",year,month);
else if(month==3)
printf("%d年%d月是31天",year,month);
else if(month==5)
printf("%d年%d月是31天",year,month);
else if(month==7)
printf("%d年%d月是31天",year,month);
else if(month==8)
printf("%d年%d月是31天",year,month);
else if(month==10)
printf("%d年%d月是31天",year,month);
else if(month==12)
printf("%d年%d月是31天",year,month);
else if(month==2)
printf("%d年%d月是29天",year,month);
else if(month==4)
printf("%d年%d月是30天",year,month);
else if(month==6)
printf("%d年%d月是30天",year,month);
else if(month==9)
printf("%d年%d月是30天",year,month);
else if(month==11)
printf("%d年%d月是30天",year,month);
}
else if(month==1)
printf("%d年%d月是31天",year,month);
else if(month==3)
printf("%d年%d月是31天",year,month);
else if(month==5)
printf("%d年%d月是31天",year,month);
else if(month==7)
printf("%d年%d月是31天",year,month);
else if(month==8)
printf("%d年%d月是31天",year,month);
else if(month==10)
printf("%d年%d月是31天",year,month);
else if(month==12)
printf("%d年%d月是31天",year,month);
else if(month==2)
printf("%d年%d月是28天",year,month);
else if(month==4)
printf("%d年%d月是30天",year,month);
else if(month==6)
printf("%d年%d月是30天",year,month);
else if(month==9)
printf("%d年%d月是30天",year,month);
else if(month==11)
printf("%d年%d月是30天",year,month);
return 0;
}
p3练习3
#include<stdio.h>
int main(){
int a;
printf("输入分数(0~100):");
scanf("%d",&a);
switch(a/10)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:printf("不及格\n");break;
case 6:printf("及格\n");break;
case 7:printf("中等\n");break;
case 8:printf("good\n");break;
case 9:
case 10:printf("perfect\n");break;
}
return 0;
}