demo_3_12

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>


//存款利息的计算
int main()
{
    int p = 1000;//本金
    int n = 5;//存款年限
    //存款利息
    float r1 = 0.015, r2 = 0.021, r3 = 0.0275, r5 = 0.03, r0 = 0.0035;
    float p1 = p*(1 + n*r5);//一次存5年
    float p2 = p*(1 + 2 * r2)*(1 + 3 * r3);//先存2年，再存3年
    float p3 = p*(1 + 3 * r3)*(1 + 2 * r2);//先存3年，再存2年
    float p4 = p*pow(1 + r1, n);
    float p5 = p*pow(1 + r0 / 4, 4 * n);
    printf("%.2f\n", p1);//第一种方式的本息和
    printf("%.2f\n", p2);//第二种方式的本息和
    printf("%.2f\n", p3);//第三种方式的本息和
    printf("%.2f\n", p4);//第四种方式的本息和
    printf("%.2f\n", p5);//第五种方式的本息和
    system("pause");
    return 0;
}


//房贷还款计算
int main()
{
    int d = 300000, p = 6000;
    float r = 0.01;//利率
    float m = (log(p) - log(p - d*r)) / log(1 + r);
    float n = log(p / (p - d*r)) / log((1 + r));
    printf("m=%.1f\n", m);
    printf("n=%.1f\n", n);
    system("pause");
    return 0;
}


//改错题
int main()
{
    char c1, c2;
    c1 = 97;
    c2 = 98;
    /*c1 = 197;
    c2 = 198;*/
    int c1, c2;
    printf("c1=%c,c2=%c\n", c1, c2);
    printf("c1=%d,c2=%d\n", c1, c2);
    system("pause");
    return 0;
}

//输入数据
int main()
{
    int a, b;
    float x, y;
    char c1, c2;
    scanf("a=%db=%d", &a, &b);
    scanf("%f%e", &x, &y);
    scanf("%c%c", &c1, &c2);
    system("pause");
    return 0;
}

//将China译成密码：用原来字母后4个字符代替原来字符
int main()
{
    char c1, c2, c3, c4, c5;
    c1 = 'C', c2 = 'h', c3 = 'i', c4 = 'n', c5 = 'a';
    //编码翻译
    c1 = c1 + 4;//c1+=4;
    c2 = c2 + 4;//c2+=4;
    c3 = c3 + 4;//c3+=4;
    c4 = c4 + 4;//c4+=4;
    c5 = c5 + 4;//c5+=4;
    printf("使用putchar函数输出:>");
    putchar(c1);
    putchar(c2);
    putchar(c3);
    putchar(c4);
    putchar(c5);
    printf("\n");
    printf("使用printf函数输出:>");
    printf("%c %c %c %c %c\n", c1, c2, c3, c4, c5);
    system("pause");
    return 0;
}
//数组做
int mian()
{
    int ch[] = { "China" };
    int i;
    for (i = 0; i < ch; i++)
    {
        ch[i] += 4;
    }
    printf("%c", ch);
    system("pause");
    return 0;
}


//求圆的周长、圆的面积、圆球表面积、圆球体积、圆柱体积
int main()
{
    float r = 1.5,h=3;
    float pi = 3.14;
    //圆周长
    float CircumFerence = 2 * pi*r;
    //圆面积
    float CircleArea = pi*r*r;
    //圆球表面积
    float Surface_area_of_phere = 4 * pi * r * r;
    //圆球体积
    float SphereVolume = 4 / 3 * pi*r*r*r;
    //圆柱体积
    float CylinderVolume = pi*r*r*h;
    printf("圆周长:>%0.2f\n", CircumFerence);
    printf("圆面积:>%0.2f\n", CircleArea);
    printf("圆球表面积:>%0.2f\n", Surface_area_of_phere);
    printf("圆球体积:>%0.2f\n", SphereVolume);
    printf("圆柱体积:>%0.2f\n", CylinderVolume);
    system("pause");
    return 0;
}

int main()
{
    char c1, c2;
    //int c1,c2;
    c1 = getchar();
    c2 = getchar();
    printf("使用putchar输出:>");
    putchar(c1);
    putchar(c2);
    printf("\n");
    printf("使用printf输出:>");
    printf("%c%c\n", c1,c2);
    system("pause");
    return 0;
}