C语言设计经典英文练习题

1、.C PracticePrint 9*9 multiplication table? 1*1=1? 1*2=2 2*2=4? 1*3=3 2*3=6 3*3=9? 1*4=4,2*4=8,3*4=12 4*4=16? ? 1*9=9, .9*9=81#includeint main(void)int x,y,z;for(x=1;x=9;x+)for(y=1;y=x;y+)z=x*y;printf(%d*%d=%d,y,x,z);printf(n);Calculate 1+2!+3!+ 20!#includeint main ()int i;long long sum = 0, jc=1;for

2、 (i = 1; i = 20; +i)jc *= i;sum += jc;printf (%dn, sum);return 0;.Input x and print y Y=2X,X0;Y=4X-2,0=X=10#include int main()float x,y;printf(Please input X:);scanf(%f,&x);if(x0)y=2*x;else if(x10)y=4*x-2;elsey=6*x*(x+3);printf(Y=%fn,y);Input a string from keyboard, write a program to calculate the

3、number of alpha, digit space and other character.#includeint main()char str100;int i=0;int num=0,ch=0,blank=0,other=0;gets(str);while(stri!=0)if(stri=A & stri=a & stri=0 & stri=9)num+;else if(stri= )blank+;elseother+;i+;printf( 数字 %d 个，字母 %d 个，空格 %d 个，其他 %d 个n,num,ch,blank,other); return 0;.Read 5 i

4、nteger from keyboard to sort in descending order#includeint main()int a5=0;int i,j,t;printf( 请依次输入 5 个整数 n);for(i=0;i5;i+)/ 输入 5 个数scanf(%d,&ai);for(i=0;i5;i+)/ 从大到小排序for(j=i+1;j5;j+)if(aiaj)t=ai;ai=aj;aj=t;for(i=0;i2),write a function to generate and print first n Fibonacci numbers.#include #includ

5、e int main()int a=1,b=1,sum;int n,i;scanf(%d,&n);printf(%dn%dn,a,b);for (i=3;i=n;)sum=a+b;b=a;a=sum;if(i%1=0)printf(%dn,sum);i+;return 0;.Write a program to produce the alphabet set A to Z and then saved it into a file.#include#includeint main()FILE *fp;char ch, 10;printf( 输入文件名： n);scanf(%s, );if (

6、fp = fopen(, w) = NULL)printf(errorn);exit(0);for (ch = A; ch = A&ch = Z; ch+)fputc(ch, fp);putchar(ch);fclose(fp);putchar(10);return 0;Read a series of character from keyboard and write it to file, read to display it on screen.#include#includeint main()FILE *fp;char ch, 10;printf( 输入文件名： n);scanf(%

7、s, );if (fp = fopen(, w) = NULL)printf(errorn);exit(0);ch = getchar();.printf( 输入一行字符回车结束：n);while(ch=getchar()!=n)fputc(ch, fp);putchar(ch);fclose(fp);putchar(10);printf( 输入文件名： n);scanf(%s, );if (fp = fopen(e, r) = NULL)printf(errorn);exit(0);char a;if (fp = fopen(, r) = NULL)printf(errorn);exit(0

8、);while (!feof(fp)a = fgetc(fp);putchar(a);fclose(fp);return 0;Input one string from keyboard and use pointer to calculate to length of string#include#includeint main()char a20;char *p=a;scanf(%s, a);int i=0;while (*p != 0).p+;i+;printf(%dn, i);return 0;Give one strings and use pointer to copy this

9、string to another.#includeint main()char a20, b20;char *from=a, *to=b;scanf(%s, a);for(;*from != 0;)*to = *from;from+, to+;*to = 0;printf(%s, b);return 0;Write 1 to 20 to a file, read it and put the sum of these number at the end of file.#include#includeint main()FILE *f;int b20, j, sum = 0;for (j =

10、 0; j 20; j+)bj = j + 1;sum = sum + bj;char a10;printf( 输入文件名 :n);scanf(%s, a);if (f = fopen(a, w) = NULL).printf(error);exit(0);for (j = 0; j 20; j+)fprintf(f, %d , bj);fprintf(f, %d, sum);fclose(f);return 0;Use malloc() function to allocate 10 int units to 10 numbers and print it from 6th number u

11、sing pointer.#include#include#define len sizeof(int)int main()int *p10;int a10, i;for (i = 0; i 10; i+)scanf(%d, &ai);for (i = 0; i 10; i+)pi = (int *)malloc(len);*pi = ai;for (i = 5; i 10; i+)printf(%d , *pi);return 0;Write a function with two integer number arguments and two pointer arguments to c

12、alculate two number sum and difference, return the sum and difference with two pointers to calling function.#includeint main().int f(int *p1, int *p2);int g(int *p1, int *p2);int a, b;int *p1, *p2;p1 = &a, p2 = &b;scanf(%d %d, &a, &b);printf(%dn%d, f(p1, p2), g(p1, p2);return 0;int f(int *p1, int *p

13、2)int sum;sum = *p1 + *p2;return sum;int g(int *p1, int *p2)int dif;dif = *p1 - *p2;return dif;Using pointer to read an array of integer and print its elements in reverse order#include int main()int n, c, d, a100, b100;printf(Enter the number of elements in arrayn);scanf(%d, &n);printf(Enter the arr

14、ay elementsn);for (c = 0; c = 0; c-, d+)bd = ac;for (c = 0; c n; c+)ac = bc;printf(Reverse array isn);for (c = 0; c n; c+)printf(%dn, ac);return 0;.运算符与表达式：1.constant 常量2. variable 变量3. identify 标识符4. keywords 关键字5. sign 符号6. operator 运算符7. statement 语句8. syntax 语法9. expression 表达式10. initialition 初

15、始化11. number format 数据格式12 declaration 说明13. type conversion 类型转换14.define 、definition定义条件语句：1.select 选择2. expression 表达式3. logical expression 逻辑表达式4. Relational expression 关系表达式 5.priority 优先6. operation 运算7.structure 结构循环语句：1.circle 循环2. condition 条件3. variant 变量4. process过程 5.priority 优先6. operat

16、ion 运算数组：1. array 数组2. reference 引用3. element 元素4. address 地址5. sort 排序6. character 字符7. string 字符串8. application 应用函数：1.call 调用2.return value 返回值3.function函数4. declare 声明.5. parameter 参数 6.static 静态的7.extern 外部的指针：1. pointer 指针2. argument 参数3. array 数组4. declaration 声明5. represent 表示6. manipulate 处

17、理结构体、共用体、链表：1 structure 结构2 member 成员3 tag 标记4 function 函数5 enumerate 枚举6 union 联合（共用体）7 create 创建8 insert 插入9 delete 删除10 modify 修改文件：1、file 文件2、open 打开3、close 关闭4、read 读5、write写6、error 错误序号 主要章节常用英汉对照词汇备注1 运算符与表达式（ operator and expression ） 汉语 英语常量 constant变量 variable标识符identify关键字keywords符号 sign运

18、算符operator语句 statement语法 syntax表达式Expression初始化Initialization数据格式number format说明 Declaration.类型转换type conversion定义 Define 、 definition2 条件语句（ conditionstatement) 选择 select表达式expression逻辑表达式logical expression关系表达式Relational expression优先 priority运算 operation结构 structure3 循环语句(circle statement) 循环circle条件 condition变量 variant过程 process优先 priority运算 operation4 函数(function) 调用call返回值return value函数 function声明 declare参数 parameter静态的static外部的extern5 数组和指针(array andpointer) 数组 array 引用 reference元素 element 地址 address 排序 sort