实验四
实验任务1:
源代码:
1 #include <stdio.h> 2 #define N 4 3 #define M 2 4 5 void test1(){ 6 int x[N] = {1,9,8,4}; 7 int i; 8 9 printf("sizeof(x) = %d\n",sizeof(x)); 10 11 for(i=0;i<N;++i) 12 printf("%p: %d\n",&x[i],x[i]); 13 14 printf("x = %p\n",x); 15 } 16 17 void test2(){ 18 int x[M][N] = {{1,9,8,4},{2,0,4,9}}; 19 int i,j; 20 21 printf("sizeof(x) = %d\n",sizeof(x)); 22 23 for(i=0;i<M;++i) 24 for(j=0;j<N;++j) 25 printf("%p: %d\n", &x[i][j],x[i][j]); 26 27 printf("\n"); 28 29 printf("x = %p\n",x); 30 printf("x[0] = %p\n",x[0]); 31 printf("x[1] = %p\n",x[1]); 32 printf("\n"); 33 } 34 35 int main(){ 36 printf("测试1:int型一维数组\n"); 37 test1(); 38 39 printf("\n测试2:int型二维数组\n");
40 test2(); 41 42 return 0; 43 }
回答问题:
1.不是连续存放的,
实验任务2:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void input(int x[],int n); 5 double compute(int x[],int n); 6 7 int main(){ 8 int x[N]; 9 int n,i; 10 double ans; 11 12 while(printf("Enter n: "),scanf("%d",&n) !=EOF){ 13 input(x,n); 14 ans = compute(x,n); 15 printf("ans = %.2f\n\n",ans); 16 } 17 18 return 0; 19 } 20 21 void input(int x[],int n){ 22 int i; 23 for(i = 0;i<n;++i) 24 scanf("%d",&x[i]); 25 } 26 27 double compute(int x[],int n){ 28 int i,high,low; 29 double ans; 30 31 high = low = x[0]; 32 ans = 0; 33 34 for(i=0;i<n;++i){ 35 ans+=x[i]; 36 37 if(x[i]>high) 38 high = x[i]; 39 else if(x[i]<low) 40 low = x[i]; 41 } 42 43 ans = (ans - high - low)/(n-2); 44 45 return ans; 46 }
回答问题:函数input的功能是输出要输入的个数与数据,函数compute的功能是去除最大值和最小值后求平均数
实验任务3:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void output(int x[][N],int n); 5 void init(int x[][N],int n,int value); 6 7 int main(){ 8 int x[N][N]; 9 int n,value; 10 11 while(printf("Enter n and value: "),scanf("%d%d",&n,&value)!=EOF){ 12 init(x,n,value); 13 output(x,n); 14 printf("\n"); 15 } 16 17 return 0; 18 } 19 20 void output(int x[][N],int n){ 21 int i,j; 22 23 for(i=0;i<n;++i){ 24 for(j=0;j<n;++j) 25 printf("%d",x[i][j]); 26 printf("\n"); 27 } 28 } 29 30 void init(int x[][N],int n,int value){ 31 int i,j; 32 33 for(i=0;i<n;++i) 34 for(j=0;j<n;++j) 35 x[i][j]=value; 36 }
回答问题:
1.第二维不能省略
2.函数output的功能是将二维数组输出,函数init的功能是将输入的value的值赋给二维数组
实验任务4:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void input(int x[], int n); 5 double median(int x[], int n); 6 7 int main(){ 8 int x[N]; 9 int n; 10 double ans; 11 12 while(printf("Enter n: "),scanf("%d", &n)!=EOF){ 13 input(x,n); 14 ans = median(x,n); 15 printf("ans = %g\n\n",ans); 16 } 17 18 return 0; 19 } 20 21 void input(int x[], int n) { 22 int i; 23 for(i = 0; i < n; ++i) 24 scanf("%d", &x[i]); 25 } 26 27 double median(int x[],int n){ 28 int i,j,t; 29 double ans,a,b; 30 31 for(i = 0;i<n-1;i++) 32 for(j=0;j<n-1-i;j++) 33 if(x[j]>x[j+1]){ 34 t = x[j]; 35 x[j] = x[j+1]; 36 x[j+1] = t; 37 } 38 39 if(n%2==1) 40 ans = x[n/2]; 41 else{ 42 a=x[n/2]; 43 b=x[n/2-1]; 44 ans = (a+b)/2; 45 } 46 47 return ans; 48 }
实验任务5:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void input(int x[][N],int n); 5 void output(int x[][N],int n); 6 void rotate_to_right(int x[][N],int n); 7 8 int main(){ 9 int x[N][N]; 10 int n; 11 12 printf("Enter n: "); 13 scanf("%d",&n); 14 input(x,n); 15 16 printf("原始矩阵:\n"); 17 output(x,n); 18 19 rotate_to_right(x,n); 20 21 printf("变换后矩阵:\n"); 22 output(x,n); 23 24 return 0; 25 } 26 27 void input(int x[][N],int n){ 28 int i,j; 29 30 for(i = 0; i < n; ++i){ 31 for(j = 0;j<n;++j) 32 scanf("%d",&x[i][j]); 33 } 34 } 35 36 void output(int x[][N], int n){ 37 int i,j; 38 39 for(i = 0;i < n;++i){ 40 for(j = 0; j<n; ++j) 41 printf("%4d",x[i][j]); 42 43 printf("\n"); 44 } 45 } 46 47 void rotate_to_right(int x[][N],int n){ 48 int t,j,i; 49 for (i = 0; i < n; i++) { 50 t = x[i][n-1]; 51 for (j = n - 1; j > 0; j--) { 52 x[i][j] = x[i][j-1]; 53 } 54 x[i][0] = t; 55 } 56 }
实验任务6:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void dec_to_n(int x, int n); 5 6 int main(){ 7 int x; 8 9 while(printf("输入十进制整数: "),scanf("%d",&x) !=EOF){ 10 dec_to_n(x, 2); 11 dec_to_n(x, 8); 12 dec_to_n(x, 16); 13 14 printf("\n"); 15 } 16 17 return 0; 18 } 19 20 void dec_to_n(int x, int n){ 21 int a[100]; 22 int i=0; 23 int m; 24 if(n==2){ 25 while(x!=0){ 26 m=x%2; 27 a[i++]=m; 28 x/=2; 29 } 30 } 31 else if(n==8){ 32 while(x!=0){ 33 m=x%8; 34 a[i++]=m; 35 x/=8; 36 } 37 } 38 else if(n==16){ 39 while(x!=0){ 40 m=x%16; 41 if(m<10) 42 a[i++]=m; 43 else 44 a[i++]=m-10+'A'; 45 x/=16; 46 } 47 } 48 for (int j = i - 1; j >= 0; j--) { 49 if (a[j] < 10) { 50 printf("%d", a[j]); 51 } else { 52 printf("%c", (char)a[j]); 53 } 54 } 55 printf("\n"); 56 }
实验任务7:
源代码:
1 #include <stdio.h> 2 #define N 100 3 4 void input(int x[][N], int n); 5 void output(int x[][N], int n); 6 int is_magic(int x[][N], int n); 7 8 int main() { 9 int x[N][N]; 10 int n; 11 12 while(printf("输入n: "), scanf("%d", &n) != EOF){ 13 printf("输入方阵:\n"); 14 input(x, n); 15 16 printf("输出方阵:\n"); 17 output(x, n); 18 19 if(is_magic(x, n)) 20 printf("是魔方矩阵\n\n"); 21 else 22 printf("不是魔方矩阵\n\n"); 23 } 24 25 return 0; 26 } 27 28 void input(int x[][N], int n) { 29 int i, j; 30 for (i = 0; i < n; ++i) { 31 for (j = 0; j < n; ++j) 32 scanf("%d", &x[i][j]); 33 } 34 } 35 36 void output(int x[][N], int n) { 37 int i, j; 38 for (i = 0; i < n; ++i) { 39 for (j = 0; j < n; ++j) 40 printf("%4d", x[i][j]); 41 42 printf("\n"); 43 } 44 } 45 int is_magic(int x[][N], int n){ 46 int t = n * (n * n + 1) / 2; 47 48 int i, j; 49 for (i = 0; i < n; i++) { 50 int a = 0; 51 for (j = 0; j < n; j++) { 52 a += x[i][j]; 53 } 54 if (a!= t) { 55 return 0; 56 } 57 } 58 59 for (j = 0; j < n; j++) { 60 int b = 0; 61 for (i = 0; i < n; i++) { 62 b += x[i][j]; 63 } 64 if (b!= t) { 65 return 0; 66 } 67 } 68 69 int c = 0; 70 for (i = 0; i < n; i++) { 71 c += x[i][i]; 72 } 73 if (c!= t) { 74 return 0; 75 } 76 77 int d = 0; 78 for (i = 0; i < n; i++) { 79 d += x[i][n - 1 - i]; 80 } 81 if (d!= t) { 82 return 0; 83 } 84 85 return 1; 86 }