实验四
实验四
实验一:
源代码:
1 #include <stdio.h> 2 #define N 4 3 #define M 2 4 void test1() { 5 int x[N] = {1, 9, 8, 4}; 6 int i; 7 printf("sizeof(x) = %d\n", sizeof(x)); 8 for (i = 0; i < N; ++i) 9 printf("%p: %d\n", &x[i], x[i]); 10 printf("x = %p\n", x); 11 } 12 void test2() { 13 int x[M][N] = {{1, 9, 8, 4}, {2, 0, 4, 9}}; 14 int i, j; 15 printf("sizeof(x) = %d\n", sizeof(x)); 16 for (j = 0; j < N; ++j) 17 printf("%p: %d\n", &x[i][j], x[i][j]); 18 printf("\n"); 19 printf("x = %p\n", x); 20 printf("x[0] = %p\n", x[0]); 21 printf("x[1] = %p\n", x[1]); 22 printf("\n"); 23 } 24 int main() { 25 printf("测试1: int型一维数组\n"); 26 test1(); 27 printf("\n测试2: int型二维数组\n"); 28 test2(); 29 return 0; 30 }
运行结果:
问题:
实验二:
源代码:
1 #include<stdio.h> 2 #define N 100 3 void input(int x[],int n); 4 double compute(int x[],int n); 5 int main(){ 6 int x[N]; 7 int n,i; 8 double ans; 9 while(printf("Enter n:"),scanf("%d",&n)!=EOF){ 10 input(x,n); 11 ans=compute(x,n); 12 printf("ans=%.2f\n\n",ans); 13 } 14 return 0; 15 } 16 void input(int x[],int n){ 17 int i; 18 for(i=0;i<n;++i) 19 scanf("%d",&x[i]); 20 } 21 double compute(int x[],int n){ 22 int i,high,low; 23 double ans; 24 high=low=x[0]; 25 ans=0; 26 for(i=0;i<n;++i){ 27 ans+=x[i]; 28 if(x[i]>high) 29 high=x[i]; 30 else if(x[i]<low) 31 low=x[i]; 32 } 33 ans=(ans-high-low)/(n-2); 34 return ans; 35 }
运行结果:
问题:
实验三:
源代码:
1 #include<stdio.h> 2 #define N 100 3 void output(int x[][N],int n); 4 void init(int x[][N],int n,int value); 5 int main (){ 6 int x[N][N]; 7 int n,value; 8 while(printf("Enter n and value:"),scanf("%d%d",&n,&value)!=EOF){ 9 init(x,n,value); 10 output(x,n); 11 printf("\n"); 12 } 13 return 0; 14 } 15 void output(int x[][N],int n){ 16 int i,j; 17 for(i=0;i<n;++i){ 18 for(j=0;j<n;++j) 19 printf("%d",x[i][j]); 20 printf("\n"); 21 } 22 } 23 void init(int x[][N],int n,int value){ 24 int i,j; 25 for(i=0;i<n;++i) 26 for(j=0;j<n;++j) 27 x[i][j]=value; 28 }
运行结果:
问题:
实验四:
源代码:
1 #include <stdio.h> 2 #include <stdlib.h>\ 3 #define N 100 4 void input(int x[], int n); 5 double median(int x[], int n); 6 int main() { 7 int x[N]; 8 int n; 9 double ans; 10 11 while (printf("Enter n:"), scanf("%d", &n) != EOF) { 12 if (n <= 0 || n > N) { 13 printf("%d.\n", N); 14 continue; 15 } 16 input(x, n); 17 ans = median(x, n); 18 printf("%g\n\n", ans); 19 } 20 return 0; 21 } 22 void input(int x[], int n) { 23 for (int i = 0; i < n; i++) { 24 scanf("%d", &x[i]); 25 } 26 } 27 double median(int x[], int n) { 28 for (int i = 0; i < n - 1; i++) { 29 for (int j = 0; j < n - i - 1; j++) { 30 if (x[j] > x[j + 1]) { 31 int temp = x[j]; 32 x[j] = x[j + 1]; 33 x[j + 1] = temp; 34 } 35 } 36 } 37 if (n % 2 == 0) { 38 return (x[n / 2 - 1] + x[n / 2]) / 2; 39 } else { 40 return x[n / 2]; 41 } 42 }
运行结果:
实验五
源代码:
1 #include <stdio.h> 2 #define N 100 3 void input(int x[][N], int n); 4 void output(int x[][N], int n); 5 void rotate_to_right(int x[][N],int n); 6 int main() { 7 int x[N][N]; 8 int n; 9 printf("输入n: "); 10 scanf("%d", &n); 11 input(x, n); 12 printf("原始矩阵:\n"); 13 output(x, n); 14 rotate_to_right(x,n); 15 printf("变换后矩阵:\n"); 16 output(x, n); 17 return 0; 18 } 19 void input(int x[][N], int n) { 20 int i, j; 21 for (i = 0; i < n; ++i) { 22 for (j = 0; j < n; ++j) 23 scanf("%d", &x[i][j]); 24 } 25 } 26 void output(int x[][N], int n) { 27 int i, j; 28 for (i = 0; i < n; ++i) { 29 for (j = 0; j < n; ++j) 30 printf("%4d", x[i][j]); 31 printf("\n"); 32 } 33 } 34 void rotate_to_right(int x[][N],int n){ 35 int i,j,temp[N]; 36 for(i=0;i<n;i++){ 37 temp[i]=x[i][n-1]; 38 } 39 for(j=n-1;j>0;j--){ 40 for(i=0;i<n;i++){ 41 x[i][j]=x[i][j-1]; 42 } 43 } 44 for(i=0;i<n;i++){ 45 x[i][0]=temp[i]; 46 } 47 }
运行结果:
实验六
源代码:
1 lude <stdio.h> 2 #define N 100 3 void dec_to_n(int x, int n); 4 int main() { 5 int x; 6 while(printf("输入十进制整数: "), scanf("%d", &x) != EOF) { 7 dec_to_n(x, 2); 8 printf("\n"); 9 dec_to_n(x, 8); 10 printf("\n"); 11 dec_to_n(x, 16); 12 printf("\n"); 13 } 14 return 0; 15 } 16 void dec_to_n(int x, int n) { 17 int i = 0, temp = x; 18 int result[N] = {0}; 19 if (x == 0) { 20 printf("0"); 21 return; 22 } 23 while (temp > 0) { 24 int remainder = temp % n; 25 result[i++] = remainder; 26 temp /= n; 27 } 28 for (int j = i - 1; j >= 0; j--) { 29 if (n == 16) { 30 if (result[j] >= 10) { 31 printf("%c", 'A' + result[j] - 10); 32 } else { 33 printf("%d", result[j]); 34 } 35 } else { 36 printf("%d", result[j]); 37 } 38 }
运行结果:
实验七
源代码:
1 #include <stdio.h> 2 #define N 100 3 void input(int x[][N], int n); 4 void output(int x[][N], int n); 5 int is_magic(int x[][N], int n); 6 int main() { 7 int x[N][N]; 8 int n; 9 while (printf("输入n:"), scanf("%d", &n) != EOF) { 10 if (n % 2 == 0 || n <= 0 || n > N) { 11 printf("n 必须是一个大于0且不超过 %d 的奇数\n", N); 12 continue; 13 } 14 printf("输入方阵:\n"); 15 input(x, n); 16 printf("输出方阵:\n"); 17 output(x, n); 18 if (is_magic(x, n)) 19 printf("是魔方矩阵\n\n"); 20 else 21 printf("不是魔方矩阵\n\n"); 22 } 23 return 0; 24 } 25 void input(int x[][N], int n) { 26 int i, j; 27 for (i = 0; i < n; i++) { 28 for (j = 0; j < n; j++) { 29 scanf("%d", &x[i][j]); 30 } 31 } 32 } 33 void output(int x[][N], int n) { 34 int i, j; 35 for (i = 0; i < n; i++) { 36 for (j = 0; j < n; j++) { 37 printf("%4d", x[i][j]); 38 } 39 printf("\n"); 40 } 41 } 42 int is_magic(int x[][N], int n) { 43 int sum = 0, i, j, row_sum, col_sum, diag_sum1, diag_sum2; 44 for (i = 0; i < n; i++) { 45 sum += x[0][i]; 46 } 47 for (i = 1; i < n; i++) { 48 row_sum = 0; 49 for (j = 0; j < n; j++) { 50 row_sum += x[i][j]; 51 } 52 if (row_sum != sum) { 53 return 0; 54 } 55 } 56 for (j = 0; j < n; j++) { 57 col_sum = 0; 58 for (i = 0; i < n; i++) { 59 col_sum += x[i][j]; 60 } 61 if (col_sum != sum) { 62 return 0; 63 } 64 } 65 diag_sum1 = 0; 66 diag_sum2 = 0; 67 for (i = 0; i < n; i++) { 68 diag_sum1 += x[i][i]; 69 diag_sum2 += x[i][n - i - 1]; 70 } 71 if (diag_sum1 != sum || diag_sum2 != sum) { 72 return 0; 73 } 74 return 1; 75 }
运行结果: