task1
源码:
#include<stdio.h> #define N 4 void test1(){ int a[N] = {1,9,8,4}; int i; printf("sizeof(a) = %d\n",sizeof(a)); for (i = 0;i<N;++i) printf("%p:%d\n",&a[i],a[i]); printf("a = %p\n",a); } void test2(){ char b[N] ={'1','9','8','4'}; int i; printf("sizeof(b) = %d\n",sizeof(b)); for (i = 0;i < N;++i) printf("%p:%c\n",&b[i],b[i]); printf("b = %p\n",b); } int main(){ printf("测试1:int类型一维数组\n"); test1(); printf("\n测试2:char类型一维数组\n"); test2(); return 0; }
#include<stdio.h> #define N 2 #define M 4 void test1(){ int a[N][M] = {{1,9,8,4},{2,0,4,9}}; int i,j; printf("sizeof(a) = %d\n",sizeof(a)); for (i = 0;i < N;++i) for(j = 0;j < M;++j) printf("%p:%d\n",&a[i][j],a[i][j]); printf("\n"); printf("a = %p\n",a); printf("a[0] = %p\n",a[0]); printf("a[1] = %p\n",a[1]); printf("\n"); } void test2(){ char b[N][M] = {{'1','9','8','4'},{'2','0','4','9'}}; int i,j; printf("sizeof(b) = %d\n",sizeof(b)); for(i = 0;i < N;++i) for(j = 0;j < M;++j) printf("%p:%c\n",&b[i][j],b[i][j]); printf("\n"); printf("b = %p\n",b); printf("b[0] = %p\n",b[0]); printf("b[1] = %p\n",b[1]); } int main(){ printf("测试1:int类型两维数组"); test1(); printf("测试2:char类型两维数组"); test2(); return 0; }
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task2
源码:
#include<stdio.h> #include<string.h> #define N 80 void swap_str(char s1[N], char s2[N]); void test1(); void test2(); int main(){ printf("测试1:用两个一维char数组,实现两个字符串交换\n"); test1(); printf("测试2:用二维char数组,实现两个字符串交换\n"); test2(); return 0; } void test1(){ char views1[N] = "hey, C, I hate u."; char views2[N] = "hey, C, I love u."; printf("交换前:\n"); puts(views1); puts(views2); swap_str(views1,views2); printf("交换后:\n"); puts(views1); puts(views2); } void test2(){ char views[2][N] = {"hey,C,I hate u.", "hey,C,I love u."}; printf("交换前:\n"); puts(views[0]); puts(views[1]); swap_str(views[0],views[1]); printf("交换后:\n"); puts(views[0]); puts(views[1]); } void swap_str(char s1[N], char s2[N]){ char tmp[N]; strcpy(tmp,s1); strcpy(s1,s2); strcpy(s2,tmp); }
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task3
源码:
#include<stdio.h> #define N 80 int count(char x[]); int main(){ char words[N+1]; int n; while(gets(words)!=NULL){ n = count(words); printf("单词数:%d\n\n",n); } return 0; } int count(char x[]){ int i; int word_flag = 0; int number = 0; for(i = 0;x[i]!='\0';i++){ if(x[i] == ' ') word_flag = 0; else if(word_flag == 0){ word_flag = 1; number++; } } return number; }
#include <stdio.h> #define N 1000 int main() { char line[N]; int word_len; int max_len; int end; int i; while(gets(line) != NULL) { word_len = 0; max_len = 0; end = 0; i = 0; while(1) { while(line[i] == ' ') { word_len = 0; i++; } while(line[i] != '\0' && line[i] != ' ') { word_len++; i++; } if(max_len < word_len) { max_len = word_len; end = i; } if(line[i] == '\0') break; } printf("最长单词: "); for(i = end - max_len; i < end; ++i) printf("%c", line[i]); printf("\n\n"); } return 0; }
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task4
源码:
#include<stdio.h> #define N 100 void dec_to_n(int x,int n); int main(){ int x; printf("输入一个十进制整数:"); while(scanf("%d",&x)!=EOF){ dec_to_n(x,2); dec_to_n(x,8); dec_to_n(x,16); printf("\n输入一个十进制整数:"); } return 0; } void dec_to_n(int x,int n){ char map[] = {"0123456789ABCDEF"}; char ans[N]; int r,i; int cnt = 0; do{ r = x % n; ans[cnt] = map[r]; cnt++; x = x/n; } while(x!=0); for(i = cnt - 1;i>=0;--i){ printf("%c",ans[i]); } printf("\n"); }
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task5
源码:
#include<stdio.h> #define N 5 void input(int x[],int n); void output(int x[],int n); double average(int x[],int n); void bubble_sort(int x[],int n); int main(){ int scores[N]; double ave; printf("录入%d个分数:\n", N); input(scores, N); printf("\n输出课程分数:\n"); output(scores, N); printf("\n课程分数处理:计算均分、排序...\n"); ave = average(scores, N); bubble_sort(scores, N); printf("\n输出课程均分:%.2f\n",ave); printf("\n输出课程分数(高->低):\n"); output(scores, N); 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"); } double average(int x[],int n){ int i; double sum = 0.0,ave; for(i = 0;i<+n;i++) sum+=x[i]; ave=sum/n; return ave; } void bubble_sort(int x[], int n){ int i,j,temp,flag; for(i = 0;i < n-1;i++){ flag = 0; for(j = 0;j < n-i-1;j++){ if(x[j] < x[j+1]){ flag = 1; temp = x[j]; x[j] = x[j+1]; x[j+1] = temp; } } if(flag == 0){ break; } } for(i = 0;i < n;i++){ printf("%d ",x[i]); } }
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task6
源码:
#include <stdio.h> #include <string.h> #define N 5 #define M 20 void output(char str[][M], int n); void bubble_sort(char str[][M], int n); int main() { char name[][M] = {"Bob", "Bill", "Joseph", "Taylor", "George"}; int i; printf("输出初始名单:\n"); output(name, N); printf("\n排序中...\n"); bubble_sort(name, N); printf("\n按字典序输出名单:\n"); output(name, N); return 0; } void output(char str[][M], int n) { int i; for(i = 0; i < n; ++i) printf("%s\n", str[i]); } void bubble_sort(char str[][M], int n){ char temp[M]; int i,j,flag; for(i = 0;i < n-i-1;i++){ flag = 0; for(j = 0;j < n-i-1;j++){ if(strcmp(str[j],str[j+1]) > 0){ flag = 1; strcpy(temp,str[j]); strcpy(str[j],str[j+1]); strcpy(str[j+1],temp); } } if(flag == 0){ break; } } }
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task7
源码:
#include<stdio.h> #include<string.h> int main(){ char A[100]; char a; int i,j,num,len,flag; while(scanf("%s",&A) != EOF){ len = strlen(A); flag = 0; for(i = 0;i < len;i++){ a = A[i]; num = 0; for(j = 0;j < len;j++){ if(a == A[j]){ num++; } } if(num > 1){ printf("Yes\n"); flag = 1; break; } } if(flag == 0){ printf("No\n"); } } return 0; }
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task8
源码:
#include<stdio.h> #include<stdlib.h> #define N 100 #define M 4 void output(int x[][N], int n); void rotate_to_right(int x[][N], int n); int main() { int t[][N] = {{21, 12, 13, 24}, {25, 16, 47, 38}, {29, 11, 32, 54}, {42, 21, 33, 10}}; printf("原始矩阵:\n"); output(t, M); rotate_to_right(t, M); printf("变换后矩阵:\n"); output(t, M); system("pause"); return 0; } void output(int x[][N], int n) { int i, j; for (i = 0; i < n; ++i) { for (j = 0; j < n; ++j) printf("%4d", x[i][j]); printf("\n"); } } void rotate_to_right(int x[][N], int n) { int y[N][N]; for(int i=0;i<n;i++) for(int j=0;j<n;j++) y[i][j]=x[i][j]; for(int i=n-1;i>0;i--) { for(int j=0;j<n;j++) x[j][i]=y[j][i-1]; } for(int j=0;j<n;j++) x[j][0]=y[j][n-1]; }
截图: