List all the Prime Numbers

#include<stdio.h>
void main()
{
 int n,i,j,flag; 
 printf("\n\nEnter the limit\t:"); 
 scanf("%d",&n);
 printf("\nThe prime numbers within the given limit:\n");
 for(i=1;i<=n;i++)
  { 
  flag=0;
  for(j=2;j<=i/2;j++)
   { 
   if(i%j==0) 
    { 
    flag=1;
    break;
    }
   }
  if(flag==0)
   printf("%d\t",i);
  }
}

   

Output
Enter the limit :60

The prime numbers within the given limit:
1       2       3       5       7       11      13      17      19      23
29      31      37      41      43      47      53      59

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Solve Quadratic Equation

#include <stdio.h>
#include <math.h>
void main() 
{
 float a,b,c,d,temp,r1,r2; 
 printf("\nEnter the value of a\t:");
 scanf("%f",&a); 
 printf("Enter the value of b\t:");
 scanf("%f",&b);
 printf("Enter the value of c\t:");
 scanf("%f",&c);

 d=((b*b)-(4*c*a));
 
 if(d==0)
 {
  printf("\nRoots are real and equal\n");
  r1=-b/(2*a);
  printf("\t X1=%f \n \t X2=%f ", r1, r1 );
 }

  else if(d>0)
 {
  printf("\nRoots are real and distinct\n");
  temp=sqrt(d);

  r1=(-b+temp)/(2*a);
  r2=(-b-temp)/(2*a);

  printf("\n\tX1=%f\n\tX2=%f",r1,r2);
 }

  else
 {
  printf("\nRoots are Imaginary\n");
  d*=-1;
  temp=sqrt(d);
  r1=-b/(2*a);
  r2=temp/(2*a);
  printf("\n\tX1=(%f + %fi)\n\tX2=(%f - %fi)",r1,r2,r1,r2);
 }
}

  

Output
Enter the value of a    :1
Enter the value of b    :-11
Enter the value of c    :30

Roots are real and distinct

        X1=6.000000
        X2=5.000000

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Find the greatest of two numbers using Conditional Operator

#include<stdio.h>
void main()
{
 int n1,n2,g;
 printf("Enter Numbers (n1, n2) : ");
 scanf("%d %d",&n1,&n2);
 g=n1>n2?n1:n2;
 printf("Greatest=%d",g);
}

  

Output
Enter Numbers (n1, n2) : 5 6 

Greatest=6

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Generate the Fibonacci Series

#include<stdio.h>

void main() 
{
 int t,i,m=0,n=1,f=1; 
 printf("\n\nEnter the number of terms:");
 scanf("%d",&t); 
 printf("\n The Fibonacci Series of %d terms:\n",t);
 for(i=1;i<=t;i++)
  {
   printf("%d\t",f);
   f=m+n;
   m=n;
   n=f;
  }
}

  

Output
Enter the number of terms:10

 The Fibonacci Series of 10 terms:
1       1       2       3       5       8       13      21      34      55

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Print 1-10 using do-while loop

#include<stdio.h>
void main()
{
    int i=1;
    do{
        printf("%d\n",i);
        i++;
      }while(i=100);
}

  

Output

1
2
3
4
5
6
7
8
9
10

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Find the perimeter of a Circle

#include <stdio.h>

void main()
{
    int r;
    float pi=3.14;
    r=7;
    printf("Perimeter=%f",2*pi*r);
}

  

Output
Perimeter=43.960003

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Check whether an alphabet is Vowel or not

#include <stdio.h>

void main()
 {
  char in;
  printf("Enter Character: ");
  scanf("%c", &in);
  if(in>=65&&in<=90 || in>=97&& in<=122)
  {
   if(in<97)
   in=in+32;
   if(in=='a'||in=='e'||in=='i'||in=='o'||in=='u')
   printf("vowel");
   else
         printf("consonent");
  }
  else
   printf("Not an valid Alphabet");
 }

  

Output
Enter Character: A 
vowel

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Print the ASCII values of all the English Alphabets

#include<stdio.h>
void main()
{
 char chl='a';
 char chu='A';
 int i;
 printf("\n===========================");
 for(i=1;i<=26;i++,chu++,chl++)
    printf("\n|%c |  %d \t|| %c| %d  |",chl,chl, chu, chu);   
 printf("\n===========================");
}

  

Output
===========================
|a |  97        || A| 65  |
|b |  98        || B| 66  |
|c |  99        || C| 67  |
|d |  100       || D| 68  |
|e |  101       || E| 69  |
|f |  102       || F| 70  |
|g |  103       || G| 71  |
|h |  104       || H| 72  |
|i |  105       || I| 73  |
|j |  106       || J| 74  |
|k |  107       || K| 75  |
|l |  108       || L| 76  |
|m |  109       || M| 77  |
|n |  110       || N| 78  |
|o |  111       || O| 79  |
|p |  112       || P| 80  |
|q |  113       || Q| 81  |
|r |  114       || R| 82  |
|s |  115       || S| 83  |
|t |  116       || T| 84  |
|u |  117       || U| 85  |
|v |  118       || V| 86  |
|w |  119       || W| 87  |
|x |  120       || X| 88  |
|y |  121       || Y| 89  |
|z |  122       || Z| 90  |
===========================

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Find Area and Circumference of a Circle

#include<stdio.h>
#define PI 3.142 

void main() 
{
 float r,a,c;
 printf("\nEnter the radius of circle:\t");
 scanf("%f",&r);
 a=PI*r*r; 
 printf("\nThe area of the circle:\t%f",a);
 c=2*PI*r; 
 printf("\nThe circumference of the circle: %f",c);
}

  

Output
Enter the radius of circle: 2
The area of the circle: 12.568000
The circumference of the circle: 12.568000
Enter the radius of circle: 1
The area of the circle: 3.142000
The circumference of the circle: 6.284000

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