C语言编程题目（一）

 1 #include<stdio.h>
 2 #define NUM 8 //
 3 
 4 /*函数factorial():传入参数为所要计算阶乘的数字，应用的方法是按照阶乘的计算规则进行计算*/
 5 int factorial (int num );
 6 /*函数factorial1():的功能是，应用递归的思想进行计算阶乘*/
 7 int factorial1(int num);
 8 main()
 9 {
10     printf("%d\n",factorial(NUM));
11     printf("%d\n",factorial1(NUM));
12 }
13 int factorial(int num)
14 {
15     int i,result;
16     i=1;
17     result=1;
18 
19     while(i<=num)
20     {
21         result=result*i;
22         i++;
23     }
24     return result;
25 }
26 
27 int factorial1(int num)
28 {
29     if(num==0||num==1)
30         return 1;
31     else
32         return num*factorial1(num-1);
33     
34 }

 1 #include<stdio.h>
 2 
 3 main()
 4 {
 5     char ch;
 6     int char_num=0,int_num=0;
 7     printf("请输入字符转\n");
 8     while((ch=getchar())!=‘\n‘)
 9     {
10     if(ch>=‘a‘&&ch<=‘z‘||ch>=‘A‘&&ch<=‘Z‘)
11         char_num++;
12     else if(ch>=‘0‘&&ch<=‘9‘)
13         int_num++;
14     }
15     printf("字母数=%4d\n数字数=%4d\n",char_num,int_num);
16 }