C语言期中试卷

返回“其他历史页面”

警告

已恢复历史版本

当前版本 00000009 在备份中缺失；以下内容来自最新可读取版本 00000008。

读程序，写出程序运行的结果

1. #include <stdio.h>
   int min(int a, int b) {
       return a < b ? a : b;
   }
   main() {
       int x = -1, y = -2;
       printf("%d", min(x, y));
   }

2. #include <stdio.h>
   int inc(int a) {
       return ++a;
   }
   main() {
       int x = -1, y;
       y = inc(x);
       printf("%d\n%d", x, y);
   }

3. #include <stdio.h>
   #include <math.h>
   #define FALSE 0
   #define TRUE 1
   #define BOOL int
   
   BOOL prime(int a) {
       int i;
       for( i = 2; i <= sqrt((double)a); i++)
           if( a % i == 0)
               return FALSE;
       return TRUE;
   }
   main() {
       int x = 37, y = 91;
       printf("%d\n%d", prime(x), prime(y));
   }

4. #include <stdio.h>
   int fibonacci(int a) {
       int i, curr = 1, next = 1, temp;
       for( i = 1; i < a; i++) {
           temp = next + curr;
           curr = next;
           next = temp;
       }
       return curr;
   }
   main() {
       int i;
       for(i = 1; i < 10; i++)
           printf("%d\t", fibonacci(i));
   }

5. #include <stdio.h>
   main() {
       int x = 2, y = 1; /*assume int is 32-bit*/
       printf("%d", (~x | ~y) + (x ^ y) );
   }

6. #include <stdio.h>
   
   main() {
       int flag = 0;
       int count = 0;
       int c;
       while( (c = getchar()) != EOF ) {
           if(flag == 0) {
               if(c =='c')
                   flag ++;
           }
           else if( flag == 1) {
               if( c == 'z')
                   flag ++;
               else
                   flag = 0;
           }
           else if( flag == 2) {
               if( c == 'k')
                   count ++;
               flag = 0;
           }
       }
       printf("%d", count);
   }

   程序运行后输入czk loves c programming language! czk programs every day!

7. #include <stdio.h>
   
   main() {
       int x, y;
       x = 0!=4<=1+2*3/4<<1;
       y = (1 << 2 | 0xF0 ) ^ 071 & 8;
       printf("%d\n%d", x, y);
   }

8. #include <stdio.h>
   #define PI 3.14
   main() {
       double r;
       for( r  = 1.0; r <= 4.5; r += 1.0) {
           printf("%6.0f%6.2f%6.2f\n", r, PI*r*2, PI*r*r);
   }
   }

9. #include <stdio.h>
   enum months{JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC};
   main() {
       int days[12];
       int i;
       days[JAN] = 31;
       days[FEB] = 28;
       days[MAR] = 31;
       days[APR] = 30;
       days[MAY] = 31;
       days[JUN] = 30;
       days[JUL] = 31;
       days[AUG] = 31;
       days[SEP] = 30;
       days[OCT] = 31;
       days[NOV] = 30;
       days[DEC] = 31;
       for( i  = JAN; i <= DEC; ++i) {
           printf("month %6d has %6d days\n", i, days[i]);
       }
   }

10. #include <stdio.h>
    enum BOOL {FALSE, TRUE};
    int isdigit(int c) {
        return c >='0' && c<='9';
    }
    int islower(int c) {
        return c >='a' && c<='z';
    }
    int isupper(int c) {
        return c >='A' && c<='Z';
    }
    int isalpha(int c) {
        return isupper(c) || islower(c);
    }
    int isspace(int c) {
        return c=='\n' || c=='\t' || c==' ' || c=='\r' || c=='\v' || c=='\f';
    }
    int isxdigit(int c) {
        return isdigit(c) || (c>='a' && c <='f') || (c>='A' && c<='F');
    }
    int isalnum(int c) {
        return isalpha(c) || isdigit(c);
    }
    main() {
    int c;
        while( (c = getchar())!=EOF) {
            printf("%2d%2d%2d%2d%2d%2d%2d\n", isdigit(c), islower(c), isupper(c),
                isalpha(c), isspace(c), isxdigit(c), isalnum(c));
        }
    }

输入(共计7个字符)：b =0XF;

按要求编写程序

1. 写一个函数reverse(s)，将字符串s反转。比如

   char s[]="hello";
   reverse(s);

   这时s变成”olleh”

2. 写一个函数invert(x,p,n)，这个函数将整数x从右数第p位开始的n位反转（0变1，1变0），并将这个值返回。比如：invert(0x72, 4, 3)将返回0x6E.

3. 请写一个程序分别统计输入当中空格、水平制表符(tab)和换行符(newline)的个数，即程序运行后输入任意一些字符，以Ctrl+Z结束输入，程序输出这些字符中空格的个数、水平制表符的个数以及换行符的个数。