C语言成长学习题（七）

 1 #include <stdio.h>
 2 
 3 void main(void)
 4 {
 5     int i, n;
 6     float fac;
 7 
 8     printf("Input n: ");
 9     scanf("%d", &n);
10     for (i = 1; i<=n; i++)
11     {
12         fac = fac * i;
13         printf("%d! = %.0f\n", n, fac);
14         i++;
15     }
16 }

 1 #include <stdio.h>
 2 
 3 void main(void)
 4 {
 5     int i;
 6 
 7     for (i = 0; i <= 25; i++)
 8         printf("%c ", ‘A‘ + i);
 9      printf("\n");
10     
11     for (i = 25; i >= 0; i--)
12         printf("%c ", ‘A‘ + i);
13     printf("\n");
14 }

 1 #include <stdio.h>
 2 
 3 void main(void)
 4 {
 5     int i, sign = 1;
 6     float sum = 0.0;
 7     
 8     for (i = 1; i <=100; i++)
 9     {
10         sum = sum + (float)sign / i;
11         sign = -sign;
12     }
13     printf("sum = %f\n", sum);
14 }

 1 #include <stdio.h>
 2 
 3 void main(void)
 4 {
 5     int i;
 6     long a, b, next;
 7 
 8     a = b = 1;
 9     printf("%10ld%10ld", a, b);
10     n = 2;
11     
12     for (i = 3; i <= 30; i++)
13     {
14         next = a + b;
15         printf("%10ld", next);
16         n++;
17         if (n % 6 ==0)
18             printf("\n");
19         a = b;
20         b = next;
21     }
22     printf("\n");
23 }

 1 #include <stdio.h>
 2 
 3 void main(void)
 4 {
 5     int a, sum = 0;
 6 
 7     printf("Input data: ");
 8     scanf("%d", &a);
 9     while (a != 0)
10     {
11         printf("%4d", a);
12         sum = sum + a;
13         scanf("%4f", &a);
14     }
15     printf("\nsum = %d\n", sum);
16 }