C programming:- Control Statements and Functions - Part 2


Write a c program to convert a given decimal number to its equivalent binary number

#include <stdio.h>
#include <conio.h>
void main()
{
int n,j,a[50],i=0;
clrscr();
printf("\n enter the decimal value :-");
scanf("%d",&n);
while(n!=0)
{
a[i]=n%2;
i++;
n=n/2;
}
printf("\n binary conversion\n");
for(j=i-1;j>=0;j--)
printf("%d",a[j]);
getch();
}

write a function to accept 15 characters and display whether each input character is a  digit , a lower case or an upper case letter or a symbol
Any character is entered by the user; write a program to determine whether the character entered is a capital letter, a small case letter, a digit or a special symbol.The following table shows the range of ASCII values for various characters.
Characters
ASCII Values
A – Z
65 – 90
a – z
97 – 122
0 – 9
48 – 57
special symbols
0 - 47, 58 - 64, 91 - 96, 123 – 127

#include<stdio.h>
#include<stdlib.h>
void check();
char ch[30];
int i,n;
main()
{
          printf("limit of characters:");
          scanf("%d",&n);
          for(i=0;i<n;i++)
          {
                   printf("\nenter a Character");
                   scanf("%1s",&ch[i]);
                  
          }
          puts(ch);
          check();
}
void check()
{
          for(i=0;i<n;i++)
          {
                   if(isdigit(ch[i])) // or if (ch>=48 && ch<=57)
                   printf("\nentered character %c is a digit",ch[i]);
                   else if(isalpha(ch[i]))
                   printf("\nentered character %c is alphabet",ch[i]);
                   else if(ch>='a' &&ch<='z')
                   printf("\nentered character %c is in lowercase",ch[i]);
                   else if(ch>=97 && ch<=122)
                   printf("\nentered character %c is in upper case",ch[i]);
                            
                   else
                   printf("\nentered character %c is special symbol",ch[i]);
          }
}
/*output
limit of characters:5
enter a Character A
enter a Character B
enter a Character c
enter a Character5
enter a Character*
ABc5*
entered character A is an alphabet
entered character B is an alphabet
entered character c is an alphabet
entered character 5 is a digit
entered character * is special symbol
*/
write a C program that reads 100 integers and find how many of them are prime numbers.
#include<stdio.h>
main()
{
          int a[100],n;
          int i,j,count=0;
          printf("enter limit:");
          scanf("%d",&n);
          for(i=0;i<n;i++)
          {
                   printf("enter a number:");
                   scanf("%d",&a[i]);
                  
          }
          for(i=0;i<n;i++)
          {
                   count=0;
                   for(j=1;j<=n;j++)
                   {
                             if(a[i]%j==0)
                                      count++;
                   }
                   if(count==2)
                   printf("\n%d is a prime no",a[i]);
                   else
                   printf("\n%d is not a prime",a[i]);
                                     
          }
}

/*output

enter limit:5
enter a number:1 2 3 4 5
enter a number:enter a number:enter a number:enter a number:
1 is not a prime
2 is a prime no
3 is a prime no
4 is not a prime*/

Write a program to find the sum of the series .
S=1- 3/2! +9/4! -27/6!+……………… to n terms
#include<stdio.h>
#include<math.h>
//S=1- 3/2! +9/4! -27/6!+……………… to n terms
int fact(int a);
main()
{
          int t,sign=1;
          int s,n,i,p,q;
          printf("enter no of terms:");
          scanf("%d",&t);
          s=1;p=3;q=2;
          for(i=2;i<=n;i++)
          {
                   s=s+(p/fact(q))*(pow(-1,sign));
                   p=p*3;
                   q=q+2;
          }
          printf("sum=%d",s);
}
int fact(int a)
{
          int i,f=1;
          for(i=1;i<=a;i++)
          {        f=f*i;
          }
          return(f);
}
/*output
sum=1*/


Write a C program to find whether a number is perfect number or not
Definition of perfect number or What is perfect number? 

Perfect number is a positive number which sum of all positive divisors excluding that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3.  Sum of its divisor is
1 + 2+ 3 =6

Note: 6 is the smallest perfect number.

Next perfect number is 28 since 1+ 2 + 4 + 7 + 14 = 28

#include<stdio.h>
int main()
{
  int n,i=1,sum=0;

  printf("Enter a number: ");
  scanf("%d",&n);

  while(i<n)
  {
      if(n%i==0)
           sum=sum+i;
          i++;
  }
  if(sum==n)
      printf("%d is a perfect number",i);
  else
      printf("%d is not a perfect number",i);

  return 0;
}
/*
output

student@ubuntu:~$ ./a.out
Enter a number: 28
28 is a perfect number
Enter a number: 2
2 is not a perfect number
Enter a number: 6
6 is a perfect number
*/
Perfect numbers with in arange
#include<stdio.h>
int main()
{
  int n,i,sum;
  int min,max;

  printf("Enter the minimum range: ");
  scanf("%d",&min);

  printf("Enter the maximum range: ");
  scanf("%d",&max);

  printf("Perfect numbers in given range is: ");
  for(n=min;n<=max;n++)
{
    i=1;
    sum = 0;

    while(i<n)
   {
      if(n%i==0)
           sum=sum+i;
          i++;
    }

    if(sum==n)
      printf("%d ",n);
  }

  return 0;
}

Sample output:
Enter the minimum range: 1
Enter the maximum range: 20
Perfect numbers in given range is: 6
Write a C program to read a sentence and count the number of each type of vowels in it and print the result
#include<stdio.h>
main()
{
  char ch[20];
  int k,a=0,e=0,i=0,o=0,u=0;
  printf("enter a sentence:");
  gets(ch);
  for(k=0;ch[k]!='\0';k++)
  {
          if(ch[k]=='a')
                   a++;
          if(ch[k]=='e')
                   e++;
          if(ch[k]=='i')
                   i++;
          if(ch[k]=='o')
                   o++;
          if(ch[k]=='u')
                   u++; 
  }
printf(" sentence has \n 'a' count=%d\n 'e' count=%d\n 'i' count=%d\n 'o' count=%d\n 'u' count=%d",a,e,i,o,u);
 
}
/*
output
enter a sentence:hello how are you
 sentence has
 'a' count=1
 'e' count=2
 'i' count=0
 'o' count=3
 'u' count=1
*/
Write a c Program to find out and print all the three digit prime numbers
Refer previous programs

write a c program to generate and print a floyd’s triangle of 6 lines
#include<stdio.h>
main()
{
          int i,j,p=1;
          for(i=0;i<7;i++)
          {
                   for(j=0;j<i;j++)
                   {
                             printf("%d ",p); p++;
                   }
                   printf("\n");
          }
}
/*
output
1
2 3
4 5 6
7 8 9 10
11 12 13 14 15
16 17 18 19 20 21
*/
write an interactive program to compute the mean ,variance and standard deviationof N numbers.
#include <stdio.h>
#include <math.h>
#define MAXSIZE 10
 main()
{
    float x[MAXSIZE];
    int  i, n;
    float average, variance, std_deviation, sum = 0, sum1 = 0;
     printf("Enter the value of N \n");
    scanf("%d", &n);
    printf("Enter %d real numbers \n", n);
    for (i = 0; i < n; i++)
    {
        scanf("%f", &x[i]);
    }
    /*  Compute the sum of all elements */
    for (i = 0; i < n; i++)
    {
        sum = sum + x[i];
    }
    average = sum / (float)n;   //type casting n to float
    /*  Compute  variance  and standard deviation*/
    for (i = 0; i < n; i++)
    {
        sum1 = sum1 + pow((x[i] - average), 2);

    }
    variance = sum1 / (float)n;
    std_deviation = sqrt(variance);
    printf("Average of all elements = %.2f\n", average);
    printf("variance of all elements = %.2f\n", variance);
    printf("Standard deviation = %.2f\n", std_deviation);
}

/* output
Enter the value of N
5
Enter 5 real numbers
1 2 3 4 5
Average of all elements = 3.00
variance of all elements = 2.00
Standard deviation = 1.41
*/


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