Pointer_On_C (chapter 4部分习题)

Posted 2020-08-30 lan126

  1 #include "stdio.h"
  2 #include "stdlib.h"
  3 
  4 /*int main(void)
  5 {
  6     char ch;
  7     
  8     ch=getchar();
  9     putchar(ch);
 10 }
 11 */
 12 
 13 /*int main(void)
 14 {
 15     int blank;
 16     int counter;
 17     
 18     scanf("%d",&blank);
 19     for(counter=0;counter<blank;counter++)
 20         putchar(‘\n‘),printf("%d",counter+1);
 21 }
 22 */
 23 
 24 /*int main(void)
 25 {
 26     int leap_year;
 27     int year;
 28     
 29     scanf("%d",&year);
 30     
 31     if(year%400==0)
 32         leap_year=1;
 33     else if(year%100==0)
 34         leap_year=0;
 35     else if(year%4==0)
 36         leap_year=1;
 37     else
 38         leap_year=0;
 39     
 40     printf("%d",leap_year);
 41 }
 42 */
 43 
 44 /*int main(void)
 45 {
 46     int which_word;
 47     
 48     scanf("%d",&which_word);
 49     
 50     switch(which_word)
 51     {
 52         case 1:
 53         printf("who");
 54         break;
 55         
 56         case 2:
 57         printf("what");
 58         break;
 59         
 60         case 3:
 61         printf("when");
 62         break;
 63         
 64         case 4:
 65         printf("where");
 66         break;
 67         
 68         case 5:
 69         printf("why");
 70         break;
 71         
 72         default:
 73         printf("dont‘t know");
 74         break;
 75     }
 76 }
 77 */
 78 
 79 /*int main(void)
 80 {
 81     float sqrt_n;
 82     float guess;
 83     float preguess;
 84     
 85     scanf("%f",&sqrt_n);
 86     
 87     preguess=1.0;
 88     guess=1.0;
 89     do
 90     {
 91         preguess=guess;
 92         guess=(preguess+(sqrt_n/preguess))/2;
 93         printf("%f",guess);
 94         printf("\n");
 95     }while(preguess!=guess);
 96 }
 97 */
 98 
 99 /*int main(void)
100 {
101     int n;
102     int m;
103     
104     for(m=2;m<=100;m++)
105     {
106         for(n=2;n<m;n++)
107         {
108             if(m%n==0)
109                 break;
110         }
111         
112         if(n==m)
113         {
114             printf("%d",m);
115             printf("\n");
116         }
117     }
118 }
119 */
120 
121 /*int main(void)
122 {
123 printf( "1\n2\n" );
124 for( number = 3; number <= 100; number = number + 2 ){
125 for( divisor = 3; divisor < number; divisor = divisor + 2 ){
126 if( number % divisor == 0 )
127 break;
128 }
129 if( divisor >= number )
130 printf( "%d\n", number );
131 }
132 }
133 */
134 
135 /*int main(void)
136 {
137     int a,b,c;
138     int big;
139     int sma;
140     int mid;
141     
142     printf("please input three numbers(1,2,3)\n");
143     scanf("%d,%d,%d",&a,&b,&c);
144     
145     if(a>b)
146         if(a>c)
147         {
148             big=a;
149             
150             if(b>c)
151             {
152                 mid=b;
153                 sma=c;
154             }
155             else
156             {
157                 mid=c;
158                 sma=b;
159             }
160         }
161         else
162         {
163             big=c;
164             mid=a;
165             sma=b;
166         }
167     else
168     {
169         if(b>c)
170         {
171             big=b;
172             
173             if(a>c)
174             {
175                 mid=a;
176                 sma=c;
177             }
178             else
179             {
180                 mid=c;
181                 sma=a;
182             }
183         }
184         else
185         {
186             big=c;
187             mid=b;
188             sma=a;
189         }
190     }
191     
192     if(mid+sma>big && big-mid<sma)
193         if(mid==sma && sma==big)
194             printf("Equilateral triangle\n");
195         else if(mid!=sma && mid!=big && sma!=big)
196             printf("Inequilateral triangle\n");
197         else
198             printf("Isosceles triangle\n");
199     else
200         printf("Is not a triangle\n");    
201 }
202 */
203 
204 /*int main(void)
205 {
206 float a;
207 float b;
208 float c;
209 float temp;
210 printf( "Enter the lengths of the three sides of the triangle: " );
211 scanf( "%f %f %f", &a, &b, &c );
212 if( a < b ){
213 temp = a;
214 a = b;
215 b = temp;
216 }
217 if( a < c ){
218 temp = a;
219 a = c;
220 c = temp;
221 }
222 if( b < c ){
223 temp = b;
224 b = c;
225 c = temp;
226 }
227 if( c <= 0 || b + c < a )
228 printf( "Not a triangle.\n" );
229 else if( a == b && b == c )
230 printf( "Equilateral.\n" );
231 else if( a == b || b == c )
232 printf( "Isosceles.\n" );
233 else
234 printf( "Scalene.\n" );
235 return EXIT_SUCCESS;
236 }
237 */