实验四
实验一
task1_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; }
问题一:int型,连续存在,占4个字节
问题二:char型,连续存在,占1个字节
实验一
task1_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]); }
问题一:int型,按行连续存放,占4个字节
问题二:char型,按行连续存放,占1个字节
实验二
#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==1) 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; }
实验三 #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 i,a; for(i=0;i<n;i++){ if(x[i+1]>x[i]){ a=x[i+1]; x[i]=x[i+1]; } } return a; }
实验四 #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 i,a[i]; char b[i]; for(i=0;x>0;i++){ a[i]=x%n; if(a[i]>=10){ switch(a[i]){ case 10:b[i]='A'; break; case 11:b[i]='B'; break; case 12:b[i]='C'; break; case 13:b[i]='D'; break; case 14:b[i]='E'; break; case 15:b[i]='F'; break; } }else{ b[i]=a[i]+'0'; } x=x/n; } for(--i;i>=0;i--){ printf("%c",b[i]); } printf("\n"); }
实验五 #include<stdio.h> int main(){ int n; while(scanf("%d",&n)!=EOF){ int i,j; for(i=1;i<=n;i++){ for(j=1;j<=n;j++){ if(i<=j){ printf("%3d",i); }else{ printf("%3d",j); } } printf("\n"); } } return 0; }
收获:
进一步强化对于一维数组的理解,
同时,注意到更多的题目陷阱,如字符型等等
对于二维数组的应用,还需继续加强