【C Primer Plus】编程练习第六章

1、

#include <stdio.h>
#include <string>


int main()
{
    char ch[26];
    ch[0] = 'a';
    for (int i = 1; i < 26; i++) {
        ch[i] = 'a' + i;
    }
    for (int i = 0; i < 26; i++) {
        printf("%c", ch[i]);
    }


    getchar();
    return 0;
}

2、

#include <stdio.h>
#include <string>


int main()
{
    int i, j;
    for (i = 1; i < 6; i++) {
        for (j = 0; j <i; j++)
            printf("$");
        printf("
");
    }

    getchar();
    return 0;
}

 

3、

#include <stdio.h>
#include <string>


int main()
{
    int i, j;
    char ch[6];
    ch[0] = 'F';
    for (i = 1; i < 7; i++) {
        for (j = 0; j < i; j++) {
            ch[j] = 'F' - j;
            printf("%c", ch[j]);
        }
        printf("
");
    }

    getchar();
    return 0;
}

4、

#include <stdio.h>
#include <string>


int main()
{
    int i, j,k;
    k = 0;
    char ch[6];
    ch[0] = 'A';
    for (i = 1; i < 7; i++) {
        for (j = 0; j < i; j++) {
            ch[j] = 'A' + k;
            k++;
            printf("%c", ch[j]);
        }
        printf("
");
    }

    getchar();
    return 0;
}

 

 5、

#include <stdio.h>
#include <string>


int main()
{
    int i;
    char c;
    printf("请输入大写字母：");
    scanf("%c", &c);
    getchar();
    i = c - 'A' + 1;
    for (int a = 0; a < i; a++) {  //每一行采用三个for循环链接
        char ch = 'A'- 1;
        for (int j = 0; j < (i - a - 1); j++) {  //处理空格
            printf(" ");
        }
        for (int j = 0; j <= a; j++) {   //升序打印字母
            printf("%c", ++ch);
        }
        for (int j = 0; j < a; j++) {    //降序打印字母
            printf("%c", --ch);
        }
        
        printf("
");
    }
    getchar();
    return 0;
}

 6、

#include <stdio.h>
#include <string>


int main()
{
    int start, end, i,data,data_2,data_3;
    printf("请输入上限及下限：");
    scanf("%d,%d", &start, &end);
    getchar();
    i = end - start + 1;
    for (int a = 0; a < i; a++) {
        data = start + a;
        data_2 = data*data;
        data_3 = data_2*data;
        printf("%d    %d    %d
", data, data_2, data_3);
    }
    getchar();
    return 0;
}

 

 7、

#include <stdio.h>
#include <string>


int main()
{
    int a;
    char ch[20] = { 0 };
    printf("请输入单词：");
    scanf("%s", ch);
    getchar();
    for (a = strlen(ch)-1; a >= 0; a--) {  //下标比字符总是小一位，所以要减去1
        printf("%c", ch[a]);
    }
    getchar();
    return 0;
}

8、

#include <stdio.h>
#include <string>

int main()
{
    double a,b,c;
    printf("请输入两个浮点数：");
    while (scanf("%lf,%lf", &a, &b)) {
        getchar();
        c = (a - b) / (a*b);
        printf("两点之差除以两点之乘等于%lf
", c);
        printf("请输入两个浮点数：");
    }
    getchar();
    return 0;
}

 

9、

#include <stdio.h>
#include <string>
void haha(double a, double b);
double a, b, c;
int main()
{
    
    printf("请输入两个浮点数：");
    while (scanf("%lf,%lf", &a, &b)) {
        getchar();
        haha(a, b);
    }
    getchar();
    return 0;
}
void haha(double a, double b) {
    c = (a - b) / (a*b);
    printf("两点之差除以两点之乘等于%lf
", c);
    printf("请输入两个浮点数：");
}

10、

#include <stdio.h>
#include <string>
void haha(double a, double b);
int a, b, c, d, n;
int sum = 0;
int main()
{
    printf("Enter lower and upper integer limits：");
    scanf("%d,%d", &a, &b);
    getchar();
    while (a < b)
    {
        c = a*a;
        d = b*b;
        for (int n = a; n <= b; n++) {
            sum = sum + n*n;
        }
        printf("The sume of the squares from %d to %d is %d
", c, d, sum);
        printf("Enter next set of limits:");
        sum = 0;
        scanf("%d,%d", &a, &b);
        getchar();
    }
    printf("Done!!!");
    getchar();
    return 0;
}

 

11、

#include <stdio.h>
#include <string>

int main()
{
    int in[8] = { 0 };
    for (int i = 0; i < 8; i++) {
        printf("请输入%d个整数：",i+1);
        scanf("%d", &in[i]);
        getchar();
    }
    printf("倒序为
");
    for (int i = 7; i >= 0; i--) {
        printf("%d", in[i]);
    }
    getchar();
    return 0;
}

 

12、

13、

#include <stdio.h>
#include <string>

int main()
{
    int i = 0;
    int in[8] = { 0 };
    for (i = 1; i < 8; i++) {
        in[0] = 2;
        in[i] = in[i - 1]*2;
    }
    i = 0;
    do
    {
        printf("%d
", in[i]);
        i++;
    } while (i<8);

    getchar();
    return 0;
}

14、 由于输入的位数可能不一样，并没能做到每一个元素完全对应

#include <stdio.h>
#include <string>

int main()
{
    double in_1[8] = { 0 };
    double in_2[8] = { 0 };
    for (int i = 0; i < 8; i++) {
        scanf("%lf", &in_1[i]);
        getchar();
        in_2[0] = in_1[0];
        if(i>0)
            in_2[i] = in_1[i] + in_2[i-1];
    }
    for (int i = 0; i < 8; i++) {
        printf("%lf", in_1[i]);
        printf(" ");
    }
    printf("
");
    for (int i = 0; i < 8; i++) {
        printf("%lf", in_2[i]);
        printf(" ");
    }
    getchar();
    return 0;
}

15、

#include <stdio.h>
#include <string>

int main()
{
    char in_1[255] = { 0 };
    scanf("%s", &in_1);
    getchar();
    int len = strlen(in_1);
    printf("%s
", in_1);
    for (int i = len-1; i >=0; i--) {
        printf("%c", in_1[i]);
    }
    getchar();
    return 0;
}

 

16、

#include <stdio.h>
#include <string>

int main()
{
    int year = 0;
    double daphne = 100;
    double deirdre = 100;
    do
    {
        year++;
        daphne = daphne + 10;
        deirdre = 1.05*deirdre;

    } while (deirdre <= daphne);
    printf("在第%d年后，daphne的投资额为%f,deirdre的投资额为%f",year,daphne,deirdre );

    
    getchar();
    return 0;
}

17、

#include <stdio.h>
#include <string>

int main()
{
    int year = 0;
    double money = 100;

    do
    {
        year++;
        money = money*1.08 - 10;
        

    } while (money > 0);
    printf("在第%d年后，钱用完了",year );

    
    getchar();
    return 0;
}

 

18、

#include <stdio.h>
#include <string>

int main()
{
    int i = 0;
    int n = 5;
    do
    {
        i++;
        n = n - i;
        n = n*2;
        printf("博士第%d周的时候有朋友%d人
", i, n);
    } while (n <= 150);


    
    getchar();
    return 0;
}