实验4 数组
task1
1.1
#include <stdio.h> const int N = 4; int main() { int a[N] = {2, 0, 2, 1}; char b[N] = {'2', '0', '1', '1'}; int i; printf("sizeof(int) = %d\n", sizeof(int)); printf("sizeof(char) = %d\n", sizeof(char)); printf("\n"); for (i = 0; i < N; ++i) printf("%x: %d\n", &a[i], a[i]); printf("\n"); for (i = 0; i < N; ++i) printf("%x: %c\n", &b[i], b[i]); return 0; }
是 4
是 1
1.2
#include <stdio.h> int main() { int a[2][3] = {{1,2,3},{4,5,6}}; char b[2][3] = {{'1', '2', '3'}, {'4', '5', '6'}}; int i, j; for (i = 0; i < 2; ++i) for (j = 0; j < 3; ++j) printf("%x: %d\n", &a[i][j], a[i][j]); printf("\n"); for (i = 0; i < 2; ++i) for (j = 0; j < 3; ++j) printf("%x: %c\n", &b[i][j], b[i][j]); return 0; }
是 4
是 1
task2
#include <stdio.h> #define N 1000 int fun(int n, int m, int bb[N]) { int i, j, k = 0, flag; for (j = n; j <= m; j++) { flag=1; for (i = 2; i < j; i++) if (j%i==0) { flag = 0; break; } if (flag!=0) bb[k++] = j; } return k; } int main() { int n = 0, m = 0, i, k, bb[N]; scanf("%d", &n); scanf("%d", &m); for (i = 0; i < m - n; i++) bb[i] = 0; k = fun(n,m,bb); for (i = 0; i < k; i++) printf("%4d", bb[i]); return 0; }
task3
#include <stdio.h> const int N = 5; int find_max(int x[], int n); void input(int x[], int n); void output(int x[], int n); int main() { int a[N]; int max; input(a, N); output(a, N); max = find_max(a, N); printf("max = %d\n", max); return 0; } void input(int x[], int n) { int i; for (i = 0; i < n; ++i) scanf("%d", &x[i]); } void output(int x[], int n) { int i; for (i = 0; i < n; ++i) printf("%d ", x[i]); printf("\n"); } int find_max(int x[], int n) { int m=x[0],i; for(i=1;i<n;++i) if(x[i]>m) m=x[i]; return m; }
task4
#include <stdio.h> void dec2n(int x, int n); int main() { int x; printf("输入一个十进制整数: "); scanf("%d", &x); dec2n(x, 2); dec2n(x, 8); dec2n(x, 16); return 0; } void dec2n(int x, int n) { int a[99],i=0,result; while(x>0) { a[i]=x%n; x=x/n; i++; } for(i-=1;i>=0;i--) { switch(a[i]) { case 10: printf("A");break; case 11: printf("B");break; case 12: printf("C");break; case 13: printf("D");break; case 14: printf("E");break; case 15: printf("F");break; default: printf("%d",a[i]); } } printf("\n"); }
task5
#include<stdio.h> int main() { int n; while(printf("Enter n:"),scanf("%d",&n)!=EOF) { int x[n][n],i,j,r,c;//r为行,c为列 for(r=0;r<n;r++) for(c=0;c<n;c++) x[r][c]=1; for(r=0,c=0;r<n;r++,c++) for(i=0;i<r;i++) for(j=0;j<c;j++) x[i][j]+=1; for(r=n-1;r>=0;r--) { for(c=n-1;c>=0;c--) printf("%d ",x[r][c]); printf("\n"); } } return 0; }
总结:学会了数组、二维数组的使用,并且可以初步正确运用二维数组