Write the following program using \"C\" language 1. Write a program using functi

Question

Write the following program using "C" language

1. Write a program using function(use return in each function and the variable be used as parameters):--To round the floating point number to 3 digits.eg if input is 3456.7856 output should be 3456.786

2. Write a program to show whether the year is a leap year or not .If it is then add the digits of the year and write the sum                                   

Format of output should be:

Enter the Year                   2016

2016 is a leap year and sum of digits is 9

3. Write a program   

If a>b then swap two numbers

If a<b then subtract two numbers

If two numbers are equal then add the numbers

The output should be displayed this way

5>3                         a=3                         b=5

3<5                         c=b-a                     c=2

5==5                      c=b+a                    c=10

Explanation / Answer

1.
#include<stdio.h>
#include<conio.h>
float round(float n)
{
   char charn[10],ch[10],c;
   int n1,j,i;
   float nn;
   clrscr();
   sprintf(charn,"%f",n);
   printf("%s",charn);
   for(i=0;i<10;i++)
   {
       if(charn[i]=='.')
       {
           c=charn[i+3];
           n1=atoi(c);
           printf(" %d",n1);
           n1++;
           charn[i+3]=itoa(n1);
           j=i+3;
           break;
       }
   }

   for(i=0;i<=j;i++)
   {
       ch[i]=charn[i];
   }
   printf(" %s",ch);
   nn=(float)atof(ch);
   return nn;
}

void main()
{
   float aa=3456.7856,bb;
   bb=round(aa);
   printf("%f",bb);
   getch();

}
  

2.
#include<stdio.h>
#include<conio.h>

void main()
{
   int a,year;

   clrscr();

   printf(" Enter year");
   scanf("%d",&year);

   a=year%4;
   y=year;
   if(a==0)
   {
       for(i=0;i<4;i++)
       {
           sum=sum+(year%10);
           year=year/10;
       }
       printf("%d Year is Leap and sum of digits is %d",y,sum);

   }
   else
   {
       printf(" Year is not Leap");
   }
   getch();
}

3.

#include<stdio.h>
#include<conio.h>

void main()
{
   int a,b;

   clrscr();

   printf("Enter no");
   scanf("%d",&a);

   printf("Enter no");
   scanf("%d",&b);

   if(a==b)
       c=a+b;

   if(a>b)
   {
       c=a;
       a=b;
       b=c;
   }
   else if(b>c)
   {
       c=b-a;
   }
   printf("%d is a, %d is b, %d is c",a,b,c);
   getch();
}

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