作业（c语言）1

#include <stdio.h>
#include <stdlib.h>
#define PI 3.14159
#define R 5.3

int main()
{
    double circumference=PI*R;
    double area=0.5*PI*R*R;
    printf("面积=%f\n",area);
    printf("半圆弧长=%f",circumference);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
    const double  length=2.0;
    const double width=3.0;
    const double height=4.0;
    double volume=length*width*height;
    printf("体积=%f",volume);
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int Chinese,math,English;
    int average;
    printf("请输入语文成绩：");
    scanf("%d",&Chinese);
    printf("请输入数学成绩；");
    scanf("%d",&math);
    printf("请输入英语成绩：");
    scanf("%d",&English);
    average=(Chinese+math+English)/3;
    printf("三科成绩的平均值为：%d",average);

    return 0;
}