C Primer Plus 第6版 Chapter 6 课后编程练习

答案为本人自己编写,仅供大家学习参考,如有错误,欢迎大家在评论区留言指正。

ex6.1

// ex_6.1
#include 
#define SIZE 26

int main(void)
{
    char arr[SIZE];
    char a = 'a';
    for (int i = 0; i < SIZE; i++, a++)
    {
        arr[i] = a;
    }

    for (int i = 0; i < SIZE; i++)
        printf("%c ", arr[i]);

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.2

// ex_6.2
#include 

int main(void)
{
    for (int i = 1; i <= 5; i++)
    {
        for (int j = 0; j < i; j++)
            printf("$");
        printf("\n");
    }

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.3

// ex_6.3
#include 

int main(void)
{
    char L = 'F';

    for (int i = 1; i <= 6; i++)
    {
        for (int j = 0; j < i; j++)
            printf("%c", L-j);
        printf("\n");
    }

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.4

// ex_6.4
#include 

int main(void)
{
    char L = 'A';

    for (int i = 1; i <= 6; i++)
    {
        for (int j = 0; j < i; j++)
            printf("%c", L++);
        printf("\n");
    }

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.5

// ex_6.5
#include 

int main(void)
{
    int c,r; // c means column, r means row

    for (c = 1; c <= 5; c++)
    {
        for (int s = 5 ;s-c > 0; s--)printf(" "); // print space
        for (r = 0; r<(c);r++)printf("%c",(r+64)+1); // ABDCE.....
        for (r = c; r>(1);r--)printf("%c",(r+64)-1); // .....DCBA
        printf("\n"); // newline
    }

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.6

// ex_6.6
#include 

int main(void)
{
    int lower = 0;
    int upper = 0;
    printf("Enter the lower limit: ");
    scanf("%d", &lower);
    printf("Enter the upper limit: ");
    scanf("%d", &upper);

    for (lower; lower <= upper; lower++)
        printf("%d\t%d\t%d\n",lower, lower * lower, lower * lower * lower);
    return 0;
}

------------------------------------------------------------------------------------------------

ex6.7

// ex_6.7
#include 
#include 

int main(void)
{
    char arr[40];
    int index = 0;

    printf("Enter a string: ");
    scanf("%s", arr);
    index = strlen(arr);
    printf("Your string: %s\n", arr);
    printf("Backward string: ");
    for (index; index > 0;index--)
        printf("%c", arr[index-1]);

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.8

// ex_6.8
#include 

int main(void)
{
    float num1 = 0;
    float num2 = 0;
    float r = 0;

    printf("Enter two numbers(Enter q to quit): ");
    while (scanf("%f%f", &num1, &num2) == 2)
    {
        r = (num1 - num2) / (num1 * num2);
        printf("(%.2f - %.2f) / (%.2f * % .2f) = %.2f\n", num1, num2, num1, num2, r);
        printf("Enter two numbers(Enter q to quit): ");
    }
    printf("quit");

    return 0;
}

------------------------------------------------------------------------------------------------

ex6.9

// ex_6.9
#include 
float f(float, float);
int main(void)
{
    float num1 = 0;
    float num2 = 0;

    printf("Enter two numbers(Enter q to quit): ");
    while (scanf("%f%f", &num1, &num2) == 2)
    {
        printf("(%.2f - %.2f) / (%.2f * % .2f) = %.2f\n", num1, num2, num1, num2, f(num1, num2));
        printf("Enter two numbers(Enter q to quit): ");
    }
    printf("quit");

    return 0;
}

float f(float a, float b)
{
    return (a - b) / (a * b);
}

------------------------------------------------------------------------------------------------

ex6.10

// ex_6.10
#include 
int square(int);
int sum(int, int);

int main(void)
{
    int lower = 0;
    int upper = 0;

    printf("Enter lower and upper integer limits: ");
    while (scanf("%d%d", &lower, &upper) == 2 && lower != upper)
    {
        printf("The sums of the squares from %d to %d is %d\n", square(lower), square(upper), sum(lower, upper));
        printf("Enter next set of limits: ");
    }
    printf("Done\n");

    return 0;
}

int square(int x)
{
    return x * x;
}

int sum(int lower, int upper)
{
    int s = 0;
    for (int i = lower; i <= upper; i++)
        s += square(i);
    return s;
}

------------------------------------------------------------------------------------------------

ex6.11

// ex_6.11
#include 

int main(void)
{
    int arr[8];
    printf("Enter eight integers: ");
    for (int i = 0; i < 8; i++)scanf("%d", &arr[i]);
    for (int i = 7; i >= 0;i--)printf("%d ", arr[i]);

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.12

// ex_6.12
#include 
#include 
float s1(int);
float s2(int);

int main(void)
{
    float sum1 = 0;
    float sum2 = 0;
    printf("\t100 terms\t1000 terms\t10,000 terms\n");
    printf("s1\t%f\t%f\t%f\n", s1(100), s1(1000), s1(10000));
    printf("s2\t%f\t%f\t%f\n", s2(100), s2(1000), s2(10000));

    return 0;
}

float s1(int n)
{
    float s = 0;
    for (int i = 0; i < n; i++)
        s += 1.0 / (i+1);
    return s;
}

float s2(int n)
{
    float s = 0;
    for (int i = 0; i < n; i++)
        s += pow(-1, i) * 1.0 / (i+1);
    return s;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.13

// ex_6.13
#include 
#include 

int main(void)
{
    int arr[8];

    for (int i = 0; i < 8; i++)
    {
        arr[i] = pow(i, 2);
    }

    int index = 0;
    do
    {
        printf("%d ", arr[index]);
        index++;
    }
    while
        (index < 8);

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.14

// ex_6.14
#include 
#define SIZE 8

int main(void)
{
    double arr1[SIZE],arr2[SIZE];
    double s = 0;

    printf("Enter eight numbers: ");
    for (int i = 0; i < SIZE; i++)scanf("%lf", &arr1[i]);
    for (int i = 0; i < SIZE; i++)
    {
        s += arr1[i];
        arr2[i] = s;
    }


    printf("ARRAY 1: ");
    for (int i = 0; i < SIZE; i++)printf("%.2f ", arr1[i]);
    printf("\n");
    printf("ARRAY 2: ");
    for (int i = 0; i < SIZE; i++)printf("%.2f ", arr2[i]);
    printf("\n");

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.15

// ex_6.15
#include 

int main(void)
{
    char arr[255];
    int i = 0;

    printf("Please enter the string: ");

    do
    {
        scanf("%c", &arr[i]);
        i++;
    }
    while (arr[i-1] != '\n');

    for (int j = i - 1; j > -1; j--)
        printf("%c" , arr[j]);

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.16

// ex_6.16
#include 

int main(void)
{
    double Daphne = 100;
    double Deirdre = 100;
    int year = 0;

    do
    {
        year++;
        Daphne = Daphne + 10;
        Deirdre = Deirdre * 1.05;
    }
    while (Daphne > Deirdre);

    printf("It takes %d years. Daphne: %.2f  Deirdre %.2f\n", year, Daphne, Deirdre);

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.17

// ex_6.17
#include 

int main(void)
{
    double deposit = 1000000;
    int year = 0;

    do
    {
        year++;
        deposit *= 1.08;
        deposit -= 100000;
    }
    while (deposit > 0);
    printf("It takes %d years for Chuckie to empty his account.\n", year);

    return 0;
}

--------------------------------------------------------------------------------------------------------------------------------------------

ex6.18

// ex_6.18
#include 

int main(void)
{
    int week = 0;
    int total = 5;
    do
    {
        week++;
        total = total - week;
        total = total * 2;
        printf("Week: %d   Number of friends: %d\n", week, total);
    }
    while (total < 150);

    return 0;
}

 

你可能感兴趣的:(c,C++,C,Primer,Plus,第六版,答案,C,自学)