#include <stdio.h> #define N 4 int main() { int a[N] = {2, 0, 2, 3}; char b[N] = {'2', '0', '2', '3'}; int i; printf("sizeof(int) = %d\n", sizeof(int)); printf("sizeof(char) = %d\n", sizeof(char)); printf("\n"); // 输出int型数组a中每个元素的地址、值 for (i = 0; i < N; ++i) printf("%p: %d\n", &a[i], a[i]); printf("\n"); // 输出char型数组b中每个元素的地址、值 for (i = 0; i < N; ++i) printf("%p: %c\n", &b[i], b[i]); printf("\n"); // 输出数组名a和b对应的值 printf("a = %p\n", a); printf("b = %p\n", b); return 0; }
(1)是,4个 (2)是,1个 (3)是,是
#include <stdio.h> #define N 2 #define M 3 int main() { int a[N][M] = {{1, 2, 3}, {4, 5, 6}}; char b[N][M] = {{'1', '2', '3'}, {'4', '5', '6'}}; int i, j; // 输出int型二维数组a中每个元素的地址、值 for (i = 0; i < N; ++i) for (j = 0; j < M; ++j) printf("%p: %d\n", &a[i][j], a[i][j]); printf("\n"); // 输出int型二维数组名a, 以及,a[0], a[1]的值 printf("a = %p\n", a); printf("a[0] = %p\n", a[0]); printf("a[1] = %p\n", a[1]); printf("\n"); // 输出char型二维数组b中每个元素的地址、值 for (i = 0; i < N; ++i) for (j = 0; j < M; ++j) printf("%p: %c\n", &b[i][j], b[i][j]); printf("\n"); // 输出char型二维数组名b, 以及,b[0], b[1]的值 printf("b = %p\n", b); printf("b[0] = %p\n", b[0]); printf("b[1] = %p\n", b[1]); printf("\n"); return 0; }
(1)是,4个 (2)一样 (3)是,1个 (4)一样 (5)a[0]的值和a的值相等,b[0]的值和b的值相等
#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: 用两个一维维数组,实现两个字符串交换\n"); test1(); printf("\n测试: 用二维数组,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); }
总结:tesk1()调用时是两个不同的数组,不加[],tesk2()调用时是一个数组,需要[]表示范围
#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; // 用作单词标志,一个新单词开始,值为1;单词结束,值为0 int number = 0; // 统计单词个数 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; // 记录最长单词长度 int end; // 记录最长单词结束位置 int i; while(gets(line) != NULL) { word_len = 0; max_len = 0; end = 0; i = 0; while(1) { // 跳过连续空格 while(line[i] == ' ') { word_len = 0; // 单词长度置0,为新单词统计做准备 i++; } // 在一个单词中,统计当前单词长度 while(line[i] != '\0' && line[i] != ' ') { word_len++; i++; } // 更新更长单词长度,并,记录最长单词结束位置 if(max_len < word_len) { max_len = word_len; end = i; // end保存的是单词结束的下一个坐标位置 } // 遍历到文本结束时,终止循环 if(line[i] == '\0') break; } // 输出最长单词 printf("最长单词: "); for(i = end - max_len; i < end; ++i) printf("%c", line[i]); printf("\n\n"); } return 0; }
先把标点符号转换成空格,再进行计算
#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,sum=0; double ave; for(i=0;i<n;i++) sum=sum+x[i]; ave=1.0*sum/n; return ave; } void bubble_sort(int x[],int n){ int i,j,t; for(i=0;i<n-1;i++) for(j=0;j<n-1-i;j++) if(x[j]<x[j+1]){ t=x[j]; x[j]=x[j+1]; x[j+1]=t; } }
#include<stdio.h> #define N 100 void dec2n(int x,int n); int main(){ int x; printf("输入一个十进制整数:"); while(scanf("%d",&x)!=EOF){ dec2n(x,2); dec2n(x,8); dec2n(x,16); printf("\n输入一个十进制整数:"); } return 0; } void dec2n(int x,int n){ int i,j,t; char str[N]={"0123456789ABCDEF"}; char num[N]; for(i=0;x!=0;i++){ t=x%n; x=x/n; num[i]=str[t]; } for(j=i-1;j>=0;j--) printf("%c",num[j]); printf("\n"); }
#include<stdio.h> #define N 100 #define M 4 void output(int x[][N],int n); void rotate_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("原始数组:\n"); output(t,M); rotate_right(t,M); printf("变换后矩阵:\n"); output(t,M); 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_right(int x[][N],int n){ int i,j,t; for(i=0;i<n;i++){ for(j=n-1;j>=0;j--){ if(j!=n-1) x[i][j+1]=x[i][j]; else t=x[i][j]; } x[i][0]=t; } }
#include<stdio.h> #define N 80 void replace(char x[],char old_char,char new_char); int main(){ char text[N]="Somebody has to win,so why not be me?"; printf("原始文本:\n"); printf("%s\n",text); replace(text,'i','*'); printf("处理后文本:\n"); printf("%s\n",text); return 0; } void replace(char x[],char old_char,char new_char){ int i; for(i=0;x[i]!='\0';++i) if(x[i]==old_char) x[i]=new_char; }
问题1:用*替换字符串中的i
问题2:'\0'是空字符,是字符串的结束标志
#include<stdio.h> #define N 80 int main(){ char str[N],ch; int i; printf("输入字符串:"); gets(str); printf("输入一个字符:"); ch=getchar(); printf("截断处理......"); i=0; while(str[i]!='\0'){ if(str[i]==ch) str[i+1]='\0'; i++; } str[i]='\0'; printf("\n截断处理后字符串:%s\n",str); return 0; }
#include<stdio.h> #include<string.h> #define N 5 #define M 20 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"); for(i=0;i<N;i++) printf("%s\n",name[i]); printf("\n排序中...\n"); bubble_sort(name,N); printf("\n按字典序输出名单:\n"); for(i=0;i<N;i++) printf("%s\n",name[i]); return 0; } void bubble_sort(char str[][M],int n){ int i,j; char t[N]; for(j=0;j<N;j++) for(i=0;i<N-1;i++) if(strcmp(str[i],str[i+1])>0){ strcpy(t,str[i]); strcpy(str[i],str[i+1]); strcpy(str[i+1],t); } }
标签:int,void,char,++,实验,str,printf From: https://www.cnblogs.com/PlanetE1151494055/p/17315655.html