*1，求y值*/
#include <stdio.h>
int main()
{
float x,y;
printf("please input a number x=\n");
scanf("%f",&x);
if(x<1)
{
y=x;
printf("y=%5.2f\n",y);
}
else if(x>=10)
{
y=3*x-11;
printf("y=%5.2f\n",y);
}
else
{
y=2*x-1;
printf("y=%5.2f\n",y);
}
return 0;
}
/*2，输入三整数，由小到大输出*/
#include <stdio.h>
int main()
{
int a,b,c;
int t;
scanf("%d %d %d",&a,&b,&c);
if (a>b) {t=a;a=b;b=t;}
if(a>c) { t=a; a=c; c=t; }
if(b>c) { t=b; b=c; c=t;}
printf("a=%d,b=%d,c=%d\n",a,b,c);
}
/*3，判断任意三个数能否构成三角形，如果能求三角形面积*/
#include<stdio.h>
#include<math.h>
int main()
{
float a,b,c,s,area;
printf("please input any digital a b c\n");
scanf("%f,%f,%f",&a,&b,&c);
if(a+b>c)
{
s=(a+b+c)/2;
area=sqrt(s*(s-a)*(s-b)*(s-c));
printf("a=%f,b=%f,c=%f\narea=%7.1f",a,b,c,area);
}
else
printf("a,b,c不能构成三角形");
return 0;
}
/*4，关于ax²+bx+c中a,b,c的讨论*/
#include<stdio.h>
#include<math.h>
int main()
{
float a,b,c,x,x1,x2,delta;
printf("plese input a b c three number\n");
scanf("%f,%f,%f",&a,&b,&c);
if(a==0)
{
if(b==0)
{
printf("it is not a quadratic equation\n");
}
else
{
x=-c/b;
printf("it is a linear equation\nx=%7.2f",x);
}
}
else
{
delta=b*b-4*a*c;
if(delta>=0)
{
x1=(-b+sqrt(delta))/(2*a);
x2=(-b-sqrt(delta))/(2*a);
printf("x1=%7.2f\nx2=%7.2f\n",x1,x2);
}
else
{
printf("no real root\n");
}
}
return 0;
}
/*5，输入一个至多五位数，判断他的位数，并将此数倒叙：*/
#include<stdio.h>
#include<math.h>
int main()
{
int N,G,S,B,Q,W,P;
printf("please input a number(0-99999):\n");
scanf("%d",&N);
if(N>9999)
P=5;
else if(N>999)
P=4;
else if(N>99)
P=3;
else if(N>9)
P=2;
else P=1;
printf("place:%d\n",P);
W=N/10000;
Q=(int)(N-W*10000)/1000;
B=(int)(N-W*10000-Q*1000)/100;
S=(int)(N-W*10000-Q*1000-B*100)/10;
G=(int)(N-W*10000-Q*1000-B*100-S*10);
switch(P){
case(5):printf("the upside down number:");
printf("%d%d%d%d%d\n",G,S,B,Q,W);
break;
case(4):printf("the upside down number:");
printf("%d%d%d%d\n",G,S,B,Q);
break;
case(3):printf("the upside down number:");
printf("%d%d%d\n",G,S,B);
break;
case(2):printf("the upside down number:");
printf("%d%d\n",G,S);
break;
case(1):printf("the upside down number:");
printf("%d\n",G);
break;
}
return 0;
}
/*6、编写程序，要求从键盘输入成绩，输出对应的等级（100分为A，90-99为A，80-89为B，70-79为C，60-69为D，小于60为E）。*/
#include<stdio.h>
int main()
{
float score;
char grade;
printf("please input your score:");
scanf("%f",&score);
while(score>100||score<0)
{
printf("your score is error!\n");
scanf("%f",&score);
}
switch((int)(score/10))
{
case 10:
case 9:grade='A';break;
case 8:grade='B';break;
case 7:grade='C';break;
case 6:grade='D';break;
case 5:
case 4:
case 3:
case 2:
case 1:
case 0:grade='E';
}
printf("your score is:%7.2f\nyour level is:%c\n",score,grade);
return 0;
}
/*7、设计一个简单的计算机程序，用户输入运算数和四则运算符（+、-、*、/），输出计算结果。*/
#include<stdio.h>
#include<math.h>
int main()
{
double a,b;
char c;
scanf("%lf%c%lf",&a,&c,&b);
switch(c)
{
case'+':printf("=%g",a+b);break;
case'-':printf("=%g",a-b);break;
case'*':printf("=%g",a*b);break;
case'/':printf("=%g",a/b);break;
}
return 0;
}
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