第三次作业

1,

#include<stdio.h>
int main()//十行三角形 
{
    printf("*
");
    printf("* *
");
    printf("* * *
");
    printf("* * * *
");
    printf("* * * * *
");
    printf("* * * * * *
");
    printf("* * * * * * *
");
    printf("* * * * * * * *
");
    printf("* * * * * * * * *
");
    printf("* * * * * * * * * *
");
    return 0;
}

2,

#include<stdio.h>
int main()//10×10矩形 
{
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    printf("* * * * * * * * * *
");
    return 0;
}

3,

#include<stdio.h>
int main()//十行倒三角型形 
{
    printf("* * * * * * * * * *
");
    printf(" * * * * * * * * *
");
    printf("  * * * * * * * *
");
    printf("   * * * * * * *
");
    printf("    * * * * * *
");
    printf("     * * * * *
");
    printf("      * * * *
");
    printf("       * * *
");
    printf("        * *
");
    printf("         *
");
    return 0;
}

4,

#include<stdio.h>
int main()//五级制成绩(A~E),输出相应的百分制成绩(0~100)区间
{
    char score;
    scanf("%c",&score);
    switch (score)
    {
        case 'A':
            printf("90~100");
            break;
        case 'B':
            printf("80~89");
            break;
        case 'C':
            printf("70~79");
            break;
        case 'D':
            printf("60~69");
            break;
        case 'E':
            printf("0~59");
            break;
    }
    return 0;
}

5,

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

6,

#include<stdio.h>
#include<math.h>
int main()//100米自由落体
{
    int g=10,t=3;
    double h;    
            h=0.5*g*pow(t,2);
    printf("%f
",h);
    return 0;
}

7,

#include<stdio.h>
int main()//输出整数152的个位数字、十位数字和百位数字的值
{
    int a;
    scanf("%d",&a);
    while(a!=0)
    {
        printf("%d
",a%10);
        a=a/10;
    }
    return 0;
}

8,

#include<stdio.h>
#include<math.h>
int main()//分段函数 
{
    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);
    return 0;
}

9,

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

10,

#include <stdio.h>
int main()//阶梯电价
{
   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;
}