c primerplus 第十章程式設計題答案

//第一題
#include <stdio.h>
#include <stdlib.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(" YEAR   RAINFALL  (inches)\n");
      for (year = 0, total = 0; year < YEARS; year++)
     {             
          for (month = 0, subtot = 0; month < MONTHS; month++)
              subtot += *(*(rain + year) + month); //注意1
         printf("%5d %15.1f\n", 2010 + year, subtot);
         total += subtot;  
     }
      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);//注意2
          printf("%4.1f ", subtot / YEARS);
      }
     printf("\n");
      return 0;
  }

//第二題 
#include <stdio.h>
#include <stdlib.h>
void copy_arr(double *target1, double *source, int i);
void copy_ptr(double *target2, double *source, int i);
void copy_ptrs(double *target3, double *source, double *i);
int main(void)
{
	double source[5] = {1.1, 2.2, 3.3, 4.4, 5.5};
	double target1[5];
	double target2[5];
	double target3[5];
	copy_arr(target1, source, 5);
	copy_ptr(target2, source, 5);
	copy_ptrs(target3, source, source + 5);
	
	int i;
	for(i = 0; i < 5; i++)
	    printf("%.1f ", target1[i]);
	printf("\n");
	for(i = 0; i < 5; i++)
	    printf("%.1f ", target2[i]);
	printf("\n");
	for(i = 0; i < 5; i++)
	    printf("%.1f ", target3[i]);
	printf("\n");

}

void copy_arr(double *target1, double *source, int i){
	int n;
	for(n = 0; n < i; n++)
	    target1[n] = source[n];
}

void copy_ptr(double *target2, double *source, int i){
	int n;
	for(n = 0; n < i; n++)
	    *(target2 + n) = *(source + n);
}
//沒搞懂給第二個參數有什麼用，隻用第一個和第三個參數也能做出來 
void copy_ptrs(double *target3, double *source, double *i){
	int n;
	for(n = 4; n >= 0; n--){
	     *(target3 + n) = *(--i); //注意是--i 
		 }
}

//第三題
#include <stdio.h>
#define h 5
int return_max(int a[], int i);
int main(void)
{
	int s;
	int a[h] = {2, 4, 1, 9, 5};
	s = return_max(a, h);
	printf("max = %d", s);
}

int return_max(int *a, int i){
	int max = *a;
	for(; i > 0; i--){
		if(a[i] > max)
		    max = a[i];
	}
	return max;
}

//第四題 
#include <stdio.h>
#define h 6
int return_max(double *a, int i);
int main(void)
{
	double a[h] = {2.9, 4, 1, 9.8, 5.1, 9.7};
	printf("max = %d", return_max(a, h));
}

int return_max(double *a, int i){
	double max = *a;
	int f = 0;
	for(; i > 0; i--){
		if(a[i] > max){
		    max = a[i];
		    f = i;
		}
	}
	return f;
}

//第五題 
#include <stdio.h>
#define h 6
double return_differ(double *a, int i);
int main(void)
{
	double a[h] = {2.9, 4, 1, 9.8, 5.1, 9.7};
	printf("differ = %lf", return_differ(a, h));
}

double return_differ(double *a, int i){
	double max = *a, min = *a;
	int n;
	for(n = 1; n < i; n++){
		if(a[n] > max)
		    max = a[n];
		    
		if(a[n] < min)
		    min = a[n];
	}
	return (max - min);
}

//第六題 
#include <stdio.h>
#define h 6
double reverse_order(double *a, int i);
int main(void)
{
	double a[h] = {2.9, 4, 1, 9.8, 5.1, 9.7};
	int i;
	reverse_order(a, h);
	for(i = 0; i < h; i++)
	    printf("a[%d] = %lf\n", i, a[i]);
	
	return 0;
}

double reverse_order(double *a, int i){
	int n, j;
	double t = 0;
	for(n = 0, j = i - 1; n < i / 2; n++, j--){
		t = a[n];
		a[n] = a[j];
		a[j] = t;
	}

}

//第七題
#include <stdio.h>
#define MONTHS 12
#define YEARS 5
//注意下面的第三個變量使用N而不能用YEARS，不然相當于使用了一個常量
void copy(double rain[][MONTHS], double s[][MONTHS], int N);
int main(void)
{
	int i, j;
	double 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 }
     };

     double s[YEARS][MONTHS];
     copy(rain, s, YEARS);

     for(i = 0; i < YEARS; i++){
         for(j = 0; j < MONTHS; j++){
         	printf("%.1f ", s[i][j]);
		 }
		 printf("\n");
}
     return 0;
}

void copy(double rain[][MONTHS], double s[][MONTHS], int N){
	int i, j;
	for(i = 0; i < YEARS; i++){
		for(j = 0; j < MONTHS; j++){
			s[i][j] = rain[i][j];
		}
	}

}

//第八題
#include <stdio.h>
#define n 7
void copy(int *a, int *b, int num);
int main(void)
{
	int a[n] = {0, 1, 2, 3, 4, 5, 6};
	int b[3];
	copy( a, b, 3);
	int i;
	for( i = 0; i < 3; i++)
	    printf("%d ", b[i]);
 } 
 
 void copy(int *a, int *b, int num){
 	int i;
 	for(i = 0; i < num; i++)
 	    *(b + i) = *(a + 3 + i);
 }

//第九章
#include <stdio.h>
#define N 3
#define M 5
void copy(int n, int m, double a[n][m], double b[n][m]);
void show(int n, int m, double a[n][m]);//先寫n、m，不然會報錯
int main(void)
{
	double a[N][M] =
      {
         { 4.3, 4.3, 4.3, 3.0, 2.0 },
         { 8.5, 8.2, 1.2, 1.6, 2.4 },
         { 9.1, 8.5, 6.7, 4.3, 2.1 },
         { 7.2, 9.9, 8.4, 3.3, 1.2 },
         { 7.6, 5.6, 3.8, 2.8, 3.8 }
     };
     double b[N][M];
     copy(N, M, a, b); //傳遞位址（為什麼函數不用使用位址，不懂）
     show(N, M, a);
     printf("\n"); 
     show(N, M, b);
     
     return 0;
}

void copy(int n, int m, double a[n][m], double b[n][m]){ //數組裡寫設定的形參，不能寫前面定義的N、M 
	int i, j;
	for(i = 0; i < n; i++){
		for(j = 0; j < m; j++){
			b[i][j] = a[i][j];
		}
	}
}

void show(int n, int m, double a[n][m]){
	int i, j;
	for(i = 0; i < n; i++){
		for(j = 0; j < m; j++){
			printf("%.2f ", a[i][j]);
		}
		printf("\n");
	}
}

#第十題
#include <stdio.h>
#define n 4
void f(int *a, int *b, int *c, int contain);
int main(void)
{
	int i;
	int a[n] = {2, 4, 5, 8};
	int b[n] = {1, 0, 4, 6};
	int c[n];
	
	f(a, b, c, n);
	
	for(i = 0; i < n; i++)
	    printf("%d ", c[i]);
	    
	return 0;
}

 void f(int *a, int *b, int *c, int contain){
 	int i;
 	
 	for(i = 0; i < contain; i++)
 	      c[i] = a[i] + b[i];
 }

//第十一題
#include <stdio.h>
void pr(int a[][5], int row);
void db(int a[][5], int row);
int main(void)
{
	int a[3][5] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
	
	pr(a, 3);//傳位址！（還是不懂為什麼，想明白再來改）  
	db(a, 3);
	pr(a, 3);
	db(a, 3);
	
	return 0;
}

void pr(int a[][5], int row){
	int i, j;
	for(i = 0; i < row; i++){
		for(j = 0; j < 5; j++){
			printf("%d ", a[i][j]);
		}
		printf("\n"); 
	}
	printf("\n");
}

void db(int a[][5], int row){
	int i, j;
	for(i = 0; i < row; i++){
		for(j = 0; j < 5; j++){
			a[i][j] *= 2;
		}
	}
}

//第十二題
#include <stdio.h>
#include <stdlib.h>
#define MONTHS 12
#define YEARS  5
void yearaver(const float rain[YEARS][MONTHS]); 
void monthaver(const float rain[YEARS][MONTHS]);
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 }
            };
    yearaver(rain);
    monthaver(rain);
    return 0;
}

void yearaver(const float rain[YEARS][MONTHS])
    {
    int year, month;
    float subtot, total;
    printf(" YEAR   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;
    }
    printf("\nThe yearly average is %.1f inches.\n\n", total / YEARS);
}

void monthaver(const float rain[YEARS][MONTHS])
{
    int year, month;
    float subtot, total;
    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");
}

//第十三題
#include <stdio.h>
#define row 3
#define col 5
void a(double m[][col], int a);
double b(double m[][col], int i);
double c(double m[][col], int n);
double d(double m[][col], int n);
void e(double m[][col], int n);
int main(void)
{
	double m[row][col];
	int i;
	printf("請輸入3X5組資料:\n");
	a(m, row);
	
	for(i = 0; i < 3; i++)
	    b(m, i);
	    
	c(m, i);
	d(m, row);
	e(m, row);
	
	return 0;
}

void a(double m[][col], int a){
	int i, j;
	for(i = 0; i < a; i++){
		for(j = 0; j < col; j++){
			scanf("%lf", &m[i][j]);
		}
	}
}

double b(double m[][col], int i){
	int j;
	double s = 0;
	for(j = 0; j < col; j++){
		s += m[i][j];
	}
	
	return s/col;
} 

double c(double m[][col], int n){
	int i, j;
	double s = 0;
	for(i = 0; i < n; i++){
		for(j = 0; j < col; j++){
			s += m[i][j];
		}
	}
	
	return s/(n * col);
}

double d(double m[][col], int n){
	double max = m[0][0];
	int i, j;
	for(i = 0; i < n; i++){
		for(j = 0; j < col; j++){
			if(m[i][j] > max)
			    max = m[i][j];
		}
	}
	
	return max;
}

void e(double m[][col], int n){
	int i, j;
	for(i = 0; i < n; i++){
		for(j = 0; j < col; j++){
			printf("%lf ", m[i][j]);
		}
		printf("\n");
	}
	printf("\n");
	
	for(i = 0; i < n; i++)
	    printf("第%d組的平均值為%lf\n", i, b(m, i));
	    
	printf("\n");
	
	printf("全部平均值為%lf\n", c(m, i));
	
	printf("max = %lf\n", d(m, n));
}

//第十四題
//第十三題 每個函數換成三個變量

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