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C Primer Plus第十章课后答案

C Primer Plus第十章课后答案

作者: 撼沧 | 来源:发表于2020-10-10 22:45 被阅读0次

    其他章节答案

    /*Project 1*/
#include<stdio.h>
#define MONTHS 12
#define YEARS 5
int main(void)
{
const float rain[YEARS][MONTHS] = 
{
    {4.3,4.3,4.3,3.0,2.0,1.2,0.2,0.2,0.4,2.4,3.5,6.6},
    {8.5,8.2,1.2,1.6,2.4,0.0,5.2,0.9,0.3,0.9,1.4,7.3},
    {9.1,8.5,6.7,4.3,2.1,0.8,0.2,0.2,1.1,2.3,6.1,8.4},
    {7.2,9.9,8.4,3.3,1.2,0.8,0.4,0.0,0.6,1.7,4.3,6.2},
    {7.6,5.6,3.8,2.8,3.8,0.2,0.0,0.0,0.0,1.3,2.6,5.2}
};
int year,month;
float subtot,total;
printf("TEAR RAINFALL (inches)\n");
for(year = 0, total = 0; year < YEARS; year++)
{
    for(month = 0,subtot = 0; month < MONTHS;month++)
        subtot += *(*(rain + year) + month);
    printf("%5d %15.1f\n", 2010 + year, subtot);
    total += subtot; /* total for all years */
}
printf("\nThe yearly average is %.1f inches.\n\n", total/YEARS);
printf("MONTHLY AVERAGES:\n\n");
printf(" Jan Feb Mar Apr May Jun Jul Aug Sep Oct ");
printf(" Nov Dec\n");
for (month = 0; month < MONTHS; month++)
{ 
    for (year = 0, subtot =0; year < YEARS; year++)
    subtot += *(*(rain + year) + month);
    printf("%4.1f ", subtot/YEARS);
}
printf("\n");
return 0;
} 
/*Project 2*/
#include<stdio.h>
#define SIZE 5
void copy_arr(double [],double [],int);
void copy_ptr(double *,double *,int);
void copy_ptrs(double *,double *,double *);
int output(double []);
int main(void)
{
    double source[SIZE] = {1.1,2.2,3.3,4.4,5.5};
    double target1[SIZE];
    double target2[SIZE];
    double target3[SIZE];
    copy_arr(target1,source,SIZE);
    copy_ptr(target2,source,SIZE);
    copy_ptrs(target3,source,source + SIZE);
    output(target1);
    output(target2);
    output(target3);
    return 0;
}
void copy_arr(double  target[],double  source0[],int n)
{
    int i;
    for(i = 0;i < n;i++)
        target[i] = source0[i];
}
void copy_ptr(double  *target,double  *source0,int n)
{
    int i;
    for(i = 0;i < n;i++)
        *(target + i) = *(source0 + i);
}
void copy_ptrs(double  *target,double  *source0,double *end)
{
    while(source0<end)
    {
        *target++ = *source0++;
    }
}
int output(double target[])
{
    int i;
    for(i = 0;i < 5;i++)
        printf("%g ",target[i]);
    printf("\n");   
    return 0;
}
/*Project 3*/
#include<stdio.h>
int max(int []);
int main(void)
{
    int aa[] = {1,2,3,4,6,1,5,7,1};
    printf("%d",max(aa));
    return 0;
}
int max(int a[])
{
    int n;
    int i = 0;
    n = a[i];
    for(i = 1;i != '\n';i++)
    {
        if(n < a[i])
            n = a[i];
    }
    return n;
}
/*Project 4*/
#include<stdio.h>
int index(double []);
int main(void)
{
    double aa[] = {1.3,2.1,3.4,4.2,6.2,2.1,4.5,4.67,9.31};
    printf("%d",index(aa));
    return 0;
}
int index(double a[])
{
    double n;
    int m;
    int i = 0;
    n = a[i];
    m = i;
    for(i = 1;i != '\n';i++)
    {
        if(n < a[i])
        {
            n = a[i];
            m = i;
        }
    }
    return m;
}
/*Project 5*/
#include<stdio.h>
double index(double []);
int main(void)
{
    double aa[] = {1.3,2.1,3.4,4.2,0.6,2.1,4.5,4.67,9.31};
    printf("%g",index(aa));
    return 0;
}
double index(double a[])
{
    double n,m;
    int i = 0;
    n = a[i];
    m = a[i];
    for(i = 1;i != '\n';i++)
    {
        if(n < a[i])
        {
            n = a[i];
        }
        if(m > a[i])
        {
            m > a[i];
        }
    }
    return n - m;
}
/*Project 6*/
#include<stdio.h>
void index(double [],int);
int main(void)
{
    double aa[] = {1.3,2.1,3.4,4.2,0.6,2.1,4.5,4.67,9.31};
    int i,n;
    n = sizeof(aa) / sizeof(aa[0]);
    index(aa,n);
    return 0;
}
void index(double a[],int n)
{
    double b[n];
    int i;
    for(i = 0;i <= n;i++)
    {
        b[i] = a[n-1-i];
    }
    for(i = 0;i <= n;i++)
    {
        a[i] = b[i];
    }
    for(i = 0;i < n;i++)
    {
        printf("%g ",a[i]);
    }
}
/*Project 7*/
#include<stdio.h>
#define SIZE1 3
#define SIZE2 3
void copy_arr(double [],double [],int);
int main(void)
{
double source[SIZE1][SIZE2] = {{1.2,3.5,5.3},{3,4.5,6.7},{2.3}};
double target[SIZE1][SIZE2];
int i,j;
for(i = 0;i< SIZE1;i++)
    copy_arr(target[i],source[i],SIZE2);
for(i = 0;i < SIZE1;i++)
{
    for(j = 0;j < SIZE2;j++)
        printf("%5g ",target[i][j]);
    printf("\n");
}
return 0;
}
void copy_arr(double  target[],double  source0[],int n)
{
    int i;
    for(i = 0;i < n;i++)
        target[i] = source0[i];
}
/*Project 8*/
#include<stdio.h>
#define SIZE1 7
#define SIZE2 3
#define NUMBER1 2
#define NUMBER2 5
void copy_arr(double [],double [],int);
int main(void)
{
    double source[SIZE1] = {1,3,5,6,7,3,2};
    double target[SIZE2];
    int i;
    copy_arr(target,source + NUMBER1,SIZE2);
    for(i = 0;i < SIZE2;i++)
        printf("%5g ",target[i]);
    printf("\n");
    return 0;
}
void copy_arr(double  target[],double  source0[],int n)
{
    int i;
    for(i = 0;i < n;i++)
        target[i] = source0[i];
}
/*Project 9*/
#include<stdio.h>
double copy(int,int,double b[*][*]);
double print(int,int,double d[*][*],double e[*][*]);
int main(void) 
{
    double a[3][5] = {{2.3,4.5,2.4,5.3,2.4},{4,3,4.2,4.5,2.3},{2.4,5.2,5.8,8.6,4.6}};
    copy(3,5,a);    //传递数组只需要输一个数组名就行了，不需要输中括号
    return 0;
 } 
 double copy(int n,int m,double b[n][m])
 {
    double c[n][m];
    for(int i = 0;i < n;i++)
        for(int j = 0;j < m;j++)
        {
            c[i][j] = b[i][j];
         }
    print(n,m,b,c);
    return 0;
 }
 double print(int n,int m,double d[n][m],double e[n][m])
 {
    for(int i = 0;i < n;i++)
    {
        for(int j = 0;j < m;j++)
        {
            printf("%5g ",d[i][j]);
        }
        printf("\n");
    }
    printf("\n");
    for(int i = 0;i < n;i++)
    {
        for(int j = 0;j < m;j++)
        {
            printf("%5g ",e[i][j]);
        }
        printf("\n");
    }
     return 0;  
 }
/*Project 10*/
#include<stdio.h>
int add(int,int a[*],int b[*],int c[*]);
#define N 4
int main(void)
{
    int a[N] = {2,4,5,8};
    int b[N] = {1,0,4,6};
    int c[N];
    add(N,a,b,c);
    for(int i = 0;i < N;i++)
    {
        printf("%3d ",c[i]);
    }
    return 0;
}
int add(int n,int a[n],int b[n],int c[n])
{
    for(int i = 0;i < n;i++)
    {
        c[i] = a[i] + b[i];
    }
    return 0;
}
/*Project 11*/
#include<stdio.h>
#define ROWS 3
#define LOWS 5
int print(int,int b[][LOWS]);
int print(int,int b[][LOWS]);
int main(void)
{
    int a[ROWS][LOWS] = {{1,3,4,5,6},{4,6,2,7,8},{4,3,6,7,2}};
    print(ROWS,a);
    doubles(ROWS,a);
    print(ROWS,a);
    return 0;
}
int doubles(int rows,int b[][LOWS])
{
    for(int i = 0;i < rows;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            b[i][j] = 2 * b[i][j];
        }
    }
    return 0;
}
int print(int rows,int b[][LOWS])
{
    for(int i = 0;i < rows;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            printf("%3d ",b[i][j]);
        }
        printf("\n");
    }
    printf("\n");
    return 0;
}
/*Project 12*/
未做，简单又麻烦
/*Project 13*/
#include<stdio.h>
#define ROWS 3
#define LOWS 5
int inputs(double a[ROWS][LOWS]);
double means(double b[LOWS]);
double meanss(double b[ROWS][LOWS]);
double maxs(double b[ROWS][LOWS]);
int main(void)
{
    double a[ROWS][LOWS];
    //a 
    inputs(a);
    printf("\n你输入的数组:\n"); 
    for(int i = 0;i < ROWS;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            printf("%g ",a[i][j]);
        }
        printf("\n");
    }
    printf("\n");
    //b
    for(int i = 0;i < ROWS;i++)
    {
        printf("第%d组平均数%g\n",i+1,means(a[i]));
    }
    printf("\n");
    //c
    printf("所有数据的平均数%g\n",meanss(a));
    printf("\n");
    //d
    printf("数据中的最大值%g\n",maxs(a));
    printf("\n");
    return 0;
}
int inputs(double a[ROWS][LOWS])
{
    char y;
    for(int i = 0;i < ROWS;i++)
    {
        printf("请输入三组double类型的数（第%d组）：",i+1);
        scanf("%lf %lf %lf %lf %lf",&a[i][0],&a[i][1],&a[i][2],&a[i][3],&a[i][4]);
    }
    return 0;
}
double means(double b[LOWS])
{
    double m = 0;
    for(int i = 0;i < LOWS;i++)
    {
        m += b[i];
    }
    return m / LOWS;
}
double meanss(double b[ROWS][LOWS])
{
    double m = 0;
    for(int i = 0;i < ROWS;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            m += b[i][j];
        }
    }
    return m / (LOWS * ROWS);
}
double maxs(double b[ROWS][LOWS])
{
    double m = 0;
    for(int i = 0;i < ROWS;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            if(m < b[i][j])
                m = b[i][j];
        }
    }
    return m;
}
/*Project 14*/
#include<stdio.h>
#define ROWS 3
#define LOWS 5
int inputs(int,int,double a[*][*]);
double means(int,double b[*]);
double meanss(int,int,double b[*][*]);
double maxs(int,int,double b[*][*]);
int main(void)
{
    double a[ROWS][LOWS];
    //a 
    inputs(ROWS,LOWS,a);
    printf("\n你输入的数组:\n"); 
    for(int i = 0;i < ROWS;i++)
    {
        for(int j = 0;j < LOWS;j++)
        {
            printf("%g ",a[i][j]);
        }
        printf("\n");
    }
    printf("\n");
    //b
    for(int i = 0;i < ROWS;i++)
    {
        printf("第%d组平均数%g\n",i+1,means(LOWS,a[i]));
    }
    printf("\n");
    //c
    printf("所有数据的平均数%g\n",meanss(ROWS,LOWS,a));
    printf("\n");
    //d
    printf("数据中的最大值%g\n",maxs(ROWS,LOWS,a));
    printf("\n");
    return 0;
}
int inputs(int rows,int lows,double a[rows][lows])
{
    char y;
    for(int i = 0;i < rows;i++)
    {
        printf("请输入三组double类型的数（第%d组）：",i+1);
        scanf("%lf %lf %lf %lf %lf",&a[i][0],&a[i][1],&a[i][2],&a[i][3],&a[i][4]);
    }
    return 0;
}
double means(int lows,double b[lows])
{
    double m = 0;
    for(int i = 0;i < lows;i++)
    {
        m += b[i];
    }
    return m / lows;
}
double meanss(int rows,int lows,double b[rows][lows])
{
    double m = 0;
    for(int i = 0;i < rows;i++)
    {
        for(int j = 0;j < lows;j++)
        {
            m += b[i][j];
        }
    }
    return m / (lows * rows);
}
double maxs(int rows,int lows,double b[rows][lows])
{
    double m = 0;
    for(int i = 0;i < rows;i++)
    {
        for(int j = 0;j < lows;j++)
        {
            if(m < b[i][j])
                m = b[i][j];
        }
    }
    return m;
}

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