第三次作业

十行倒三角形

#include<stdio.h>
int main(void)
{
    printf("* * * * * * * * * *
");
    printf(" * * * * * * * * *
");
    printf("  * * * * * * * *
");
    printf("   * * * * * * *
");
    printf("    * * * * * *
");
    printf("     * * * * *
");
    printf("      * * * *
");
    printf("       * * *
");
    printf("        * *
");
    printf("         *
");
}

十行三角形

#include<stdio.h>
int main(void)
{
    printf("*
");
    printf("**
");
    printf("***
");
    printf("****
");
    printf("*****
");
    printf("******
");
    printf("*******
");
    printf("********
");
    printf("*********
");
    printf("**********
");
}

十行矩形

#include<stdio.h>
int main(void)
{
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
    printf("**********
");
}

2-2-4 分段函数[2]

#include<stdio.h>
#include<math.h>
int main()
{
   double x;
   double y;
   scanf("%lf",&x);
   if (x>=0)
           y=sqrt(x);
    else
        y=pow(x+1,2)+2*x+1/x;
        printf("f(x)=%f",y);
}

2-2-1 分段函数[1]

#include<stdio.h>
int main()
{
   int x;
   double y;
   printf("请输出x的值");
   scanf("%d",&x);
   if (x==0)
           y=0;
    else
        y=1/(double)x;
        printf("%f",y);
}

2-1-7 整数152的各位数字

#include<stdio.h>
int main()
{
int c=152;
int gewei,shiwei,baiwei;
gewei=c%10;
shiwei=c/10%10;
baiwei=c/100%10;
printf("百位=%d, 十位=%d, 个位=%d",baiwei,shiwei,gewei);
}

2-2-3 计算存款利息

#include<stdio.h> 
#include<math.h>
int main()
{
   int money,year;
   double rate,interest,a;
   printf("请输入存款金额:");
   scanf("%d",&money); 
   printf("请输入存期:"); 
   scanf("%d",&year);
   printf("请输入年利率:");
   scanf("%lf",rate);
   a=pow(1+rate,year);
   interest=money*a-money;
   printf("利息为:%f
",interest);
   return 0;
}

阶梯电费

#include <stdio.h>
int main()
{
   int c ;
   double f;
   scanf("%d",&c);
   if(c<=50)
     {f=0.53*c;}
   else
     {f=50*0.53+(c-50)*0.05;}
   printf("费用为:%lf",f);
   return 0;
}

2-1-3 计算物体自由下落的距离

#include<stdio.h>
int main()
    double height;
    int t=3;
    height=0.5*10*t*t;
    printf("height=%.2f
",height);
    return 0;
} 

温度

#include<stdio.h>
int main() 
{
    double F;
    printf("请输入华氏温度:
");
    scanf("%lf", &F);
    printf("C = %0.2lf
", 5*(F-32)/9);
    return 0;
}