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Introduction to C language (7)

2022-07-18 17:53:00 【InfoQ】

1. What quadrant is the judgment point

Title Description

Input from keyboard 2 It's an integer x、y value , Represents a coordinate point on the plane , Judge which quadrant the coordinate point is in , And output the corresponding results .

Input

Input x,y Value represents a coordinate point . The coordinate point will not be in x Axis and y On the shaft , Nor at the origin .

Output

Output the corresponding quadrant , Use numbers 1,2,3,4 Corresponding to four quadrants respectively .>

The sample input  

1 1

Sample output  

1

#include <stdio.h>
#include <stdlib.h>
int main()
 
{
 int a,b;
 scanf(&quot;%d %d&quot;,&a,&b);
if(a>0&&b>0)
 printf(&quot;1&quot;);
if(a<0&&b>0)
 printf(&quot;2&quot;);
if(a<0&&b<0)
 printf(&quot;3&quot;);
if(a>0&&b<0)
 printf(&quot;4&quot;);
 
 return 0;
}

2. Staff salaries

Title Description

Regulations of a company , The salary of salesperson consists of basic salary and sales commission , The basic salary is 1500 element / month , The sales commission rules are as follows ： Sales volume is less than or equal to 10000 Yuan time , according to 5% Royalty ; Sales greater than 10000 Yuan but less than or equal to 50000 Yuan time , beyond 10000 Partly according to 3% Royalty ; Sales greater than 50000 Yuan time , beyond 50000 Partly according to 2% Royalty . Programming , Calculate employee income based on sales .

Input

Enter an integer to represent sales

Output

Output employees' salaries , Retain 2 Decimal place .

The sample input  

30000

Sample output  

2600.00

#include <stdio.h>
#include <stdlib.h>
int main()
 
{
 int a;
 double m;
 scanf(&quot;%d&quot;,&a);
if(a<=10000)
 m=a*0.05+1500;
if(a>10000&&a<=50000)
 m=(a-10000)*0.03+1500+500;
if(a>50000)
 m=(a-50000)*0.02+1500+500+1200;
printf(&quot;%.2lf&quot;,m);
 return 0;
}

3. Five grade system

Title Description

Given a 100 point score , Please output the corresponding grade according to the hundred mark system . The transformation relationship is as follows ：90 Points and above are ’A’,80~89 by ’B’, 70~79 by ’C’, 60~69 by ’D’,60 It is divided into the following ’E’.

Input

A hundred mark mark （0~100 The integer of ).

Output

Output corresponding level .

The sample input  

Sample output  

A

#include <stdio.h>
#include <stdlib.h>
int main()
 
{
 int m;
 scanf(&quot;%d&quot;,&m);
 if(m>=90)
 printf(&quot;A&quot;);
 if(m>79&&m<90)
 printf(&quot;B&quot;);
 if(m>69&&m<80)
 printf(&quot;C&quot;);
 if(m>59&&m<70)
 printf(&quot;D&quot;);
 if(m<60)
 printf(&quot;E&quot;);
 
 return 0;
}

4. Summer sales

Title Description

Shopping mall summer promotion , shopping 500 Yuan of the following , No discount ; shopping 500 element （ contain ） above ,95 fold ; shopping 1000 element （ contain ） above ,9 fold ; shopping 3000 element （ contain ） above ,85 fold ; shopping 5000 element （ contain ） above ,8 fold . According to the consumption amount , Determine the amount that the user actually needs to pay .

Input

Enter a real number , Indicates the consumption amount .

Output

Output a real number , It indicates the actual amount that the user needs to spend , Keep two decimal places .

The sample input  

5100

Sample output  

4080.00

#include <stdio.h>
#include <stdlib.h>
int main()
 
{
 int m;
 double n;
 scanf(&quot;%d&quot;,&m);
 if(m>=5000)
 n=0.8*m;
 if(m>=1000&&m<3000)
 n=0.9*m;
 if(m>=500&&m<1000)
 n=0.95*m;
 if(m<500)
 n=m;
 if(m>=3000&&m<5000)
 n=0.85*m;
printf(&quot;%.2f&quot;,n);
 
 return 0;
}

5. Piecewise function evaluation

Title Description

It is known that ：y yes x Function of , When x<-2 when ,y=7-2x; When x>=-2, And x<3 when ,y=5-|3x+2|; When x>=3 when ,y=3x+4

Input

Enter any integer x.

Output

The output is an integer , namely x The corresponding function value .

The sample input  

2

Sample output  

-3

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int main()
 
{
 int x,y;
 scanf(&quot;%d&quot;,&x);
 if(x<-2)
 y=7-2*x;
 if(x>=-2&&x<3)
 y=5-fabs(3*x+2);
 if(x>=3)
 y=3*x+4;
printf(&quot;%d&quot;,y);
 
 return 0;
}