浙大版《C语言程序设计（第3版）》题目集 习题3(1-5)

习题3-1 比较大小 (10 分)

代码示例:

#include <stdio.h> 
int main()
{
    int x, y, z, t;
    scanf("%d %d %d", &x, &y, &z);
    if (x > y)
    {
        t = y; y = x; x = t;
    }
    else if (x > z)
    {
        t = z; z = x; x = t;
    }
    else if (y > z)
    {
        t = z; z = y; y = t;
    }
    printf("%d->%d->%d", x, y, z);
    return 0;

习题3-2 高速公路超速处罚 (15 分)

代码示例:

#include<stdio.h>

int main()
{
	int s,l;
	scanf("%d %d",&s,&l);
	double m = 1.0*(s-l)/l*100;
	if(m < 10)
		printf("OK");
	else if(m >= 10 && m < 50)
		printf("Exceed %.0lf%%. Ticket 200",m);
	else 
		printf("Exceed %.0lf%%. License Revoked",m);
	return 0;	
}

习题3-3 出租车计价 (15 分)

代码示例:

#include<stdio.h>
#include<math.h>
int main()
{
	double s,p,p2;
	int m;
	scanf("%lf %d",&s,&m);
	if(m < 5)
		p2 = 0;
	else
		p2 = m / 5 *2;
	if(s <= 3)
		p = 10 + p2;
	else if(s <= 10)
		p = 10 + (s-3)*2 + p2;
	else 
		p = 10 + 7*2 + (s - 10)*3 + p2;
	printf("%.0f",round(p));  \\round函数四舍五入返回值类型为浮点
	return 0;	
}

习题3-4 统计学生成绩 (15 分)

代码示例:

#include<stdio.h>

int main()
{
	int i,n,score;
	int a,b,c,d,e;
	a = b = c = d = e = 0;
	scanf("%d",&n);
	for(i = 0 ; i < n ; i++)
	{
		scanf("%d",&score);
		if(score >= 90) a++;
		if(score < 90 && score >= 80) b++;
		if(score < 80 && score >= 70) c++;
		if(score < 70 && score >= 60) d++;
		if(score < 60) e++;
	}
	printf("%d %d %d %d %d",a,b,c,d,e);
	return 0;
}

习题3-5 三角形判断 (15 分)

代码示例:

#include <stdio.h>
#include <math.h>

/* 三角形面积(海伦公式) s =  sqrt(s * (s - a) * (s - b) * (s - c))  */
double L(double x1, double y1, double x2, double y2)
{
	return sqrt(pow(x1-x2,2) +  pow(y1-y2,2));
}
int main()
{
    double x1, y1, x2, y2, x3, y3, a, b, c, s;
    scanf("%lf %lf %lf %lf %lf %lf", &x1, &y1, &x2, &y2, &x3, &y3);
    a = L(x1, y1, x2, y2);
    b = L(x1, y1, x3, y3);
    c = L(x2, y2, x3, y3);
    s = (a + b + c) / 2;
    if (a + b > c && a + c > b && b + c > a)
        printf("L = %.2lf, A = %.2lf", a + b + c, sqrt(s *(s - a) *(s - b) *(s - c)));
    else
        printf("Impossible");
    return 0;
}