XJTU University Computer Programming Assignment Week 7

first question:

Title description:

Write a program, the user enters any 3 decimals; add these 3 decimals and display the result; convert the result to an integer by rounding and display.

Input and output format:
input: 3 decimals, space separated;
output: and, rounded integer, 1 line display, space separated

Sample input:

1.1 2.2 3.3

Sample output:

 6.6 7

参考代码: (This code originally used double and float, and neither% lf nor% f was used for output, but changed to AC after% g)

#include <stdio.h>
#include <math.h>
int main ()
{
  float a,b,c;
  scanf("%f%f%f",&a,&b,&c);
  printf("%g %.0f",a+b+c,a+b+c);
  return 0;
}

* Special notes:

Function name	Function description	2.1	2.9	-2.1	-2.9
Floor()	The largest integer not greater than the independent variable	2	2	-3	-3
Ceil()	The largest integer not less than the independent variable	3	3	-2	-2
Round()	Round to the nearest integer	2	3	-2	-3

Information from https://blog.csdn.net/inter_peng/article/details/51397646

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The second question:

Title description:

Enter a decimal integer (int type), output the hexadecimal form of the number, and then output the corresponding values ​​of the upper 2 bytes and lower 2 bytes of the number in hexadecimal form, separated by commas.

Input and output format:

Input: an integer (decimal)

Output: hexadecimal of the number in the first line; high-end 2 bytes of the hexadecimal number (comma separated) in the second line (lower-end 2 bytes of the hexadecimal number)

Tip: int a = 1; printf ("% 04d", a); then the output is: 0001

Sample input:

 -32768

Sample output:

 ffff8000
 ffff,8000

参考代码：

#include<stdio.h>
int main()
{
    int a;
    scanf("%d", &a);
    printf("%x\n", a);//%x是以十六进制数形式输出整数
    int b = a >> 16;// >>右移16位，此时b=00000000 00000000
    printf("%04x,%04x", b & 0x0000FFFF, a & 0x0000FFFF);//int a=1;printf("%04d",a);则输出为：0001
    return 0;
}

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The third question:

Title description:

Write a program, input a three-digit positive integer, output one digit, ten digits and hundred digits respectively, separated by commas (comma).

Input and output format:

Input: positive integer (between 100 and 999)

Output: single digits, tens digits, hundreds digits (comma separated three digits)

Sample input:

  103  

Sample output:

  3,0,1

参考代码：

#include <stdio.h>
int main()
{
  unsigned int n;
  char c1,c2,c3;
  scanf("%d",&n);
  c1=(n%100)%10+'0';
  c2=(n/10)%10+'0';
  c3=n/100+'0';
  printf("%c,%c,%c",c1,c2,c3);
  return 0;
}

The fourth question:

Title description:

Input a capital English letter, and output the adjacent letter string (consider the letter AZ as a ring-like arrangement with the ending).

Input and output format:

Input: Uppercase English letters

Output: the letter before the letter, the letter, the letter after the letter. (No space between three letters)

Sample input:

V

Sample output:

UVW

参考代码:

#include<stdio.h>
int main()
{
    char a, m, n; int b, c, d;
    scanf("%c", &a);
    switch (a)
    {
    case 'A':
        printf("ZAB");
        break;
    case 'Z':
        printf("YZA");
        break;     //容易考虑不周全
    default:
        b = a;
        c = b - 1, d = b + 1;
        m = c, n = d;     //强制类型转换
        printf("%c%c%c", m, b, n);
    }
    return 0;
}

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