[introduction to C language] zzulioj 1006-1010

ZZULIOJ 1006:  Find the sum of the arithmetic sequence

Title Description

Give three integers , Respectively represent the first term of the arithmetic sequence 、 Last item and tolerance , Find the sum of the sequence .

Input

Enter three integers , Space between . The first 1 Number as the first item , The first 2 Number as the last term , The first 3 Number as tolerance .

Output

Output takes up one line , Contains an integer , Is the sum of the arithmetic sequence .

The sample input

2 11 3

Sample output

26

#include <stdio.h>#include <stdlib.h> int main(){
       int   x ,y ,z ;    scanf ("%d %d %d",&x,&y,&z);    printf("%d",(x+y)*((y-x)/z+1)/2);    return 0;}

ZZULIOJ 1007:  Chicken and rabbit in the same cage

Title Description

The chicken and the rabbit are kept in a cage , Chicken has 2 One foot , The rabbit has 4 One foot , No exceptions . It is known that you can now see in the cage m Size and n One foot , Ask how many chickens and rabbits there are ？

Input

Enter two integers heads and feet, They represent the number of heads and feet in the cage .( hypothesis heads and feet Are within the legal data range )

Output

Output the number of chickens and rabbits in turn .（ The number is 0 Also output ）

The sample input

12 40

Sample output

4 8

#include <stdio.h>#include <stdlib.h> int main(){
       int   x,y,m,n;    scanf("%d %d",&m,&n);    x=2*m-0.5*n;    y=0.5*n-m;    printf("%d %d",x,y);    return 0;}

ZZULIOJ 1008:  US dollars and RMB

Title Description

The dollar is falling more and more , It doesn't seem a good thing to have too many dollars on hand . Quickly calculate how much RMB your dollars are worth . Suppose the exchange rate between us dollar and RMB is 1 Exchange US dollars for 6.5573 RMB , Write a program to enter the amount in US dollars , Output convertible RMB amount .

Input

Enter a real number , Amount in US dollars .

Output

Output the value of convertible RMB . Output reserved 2 Decimal place .

The sample input

100

Sample output

655.73

#include <stdio.h>#include <stdlib.h> int main(){
       double m;    scanf("%lf",&m);    printf("%.2lf\n",m*6.5573);    return 0;}

ZZULIOJ 1009:  Average score

Title Description

Know a student's math 、 Grades in English and computer courses , Find the average score of the student's three courses .

Input

Enter three integers , Data is separated by spaces .

Output

Output takes up one line , Contains a real number , The average score of three courses , Keep two decimal places .

The sample input

87 73 93

Sample output

84.33

#include <stdio.h>#include <stdlib.h> int main(){
       double a ,b, c;    scanf("%lf %lf %lf",&a,&b,&c);    printf("%.2lf\n",(a+b+c)/3);    return 0;}

ZZULIOJ 1010:  Find the circumference and area of a circle

Title Description

Enter the radius of the circle , Find the circumference and area of a circle . It is required to define the PI as the following macro constant #define PI 3.14159

Input

Enter the radius r Value , Is a real number .

Output

Output one line , Including perimeter and area . The data is separated by a space , Keep the data to the last two decimal places .

The sample input

3

Sample output

18.85 28.27

#include <stdio.h>#include <stdlib.h>#define PI 3.14159int main(){
       double r,c,s;    scanf("%lf",&r);    c=2*PI*r;    s=PI*r*r;    printf("%.2f %.2f\n",c,s);    return 0;}