Find the GCD of two numbers

Using For Loop

#include<stdio.h>
int main(){
    int x,y,m,i;
    do
    {
        printf("Enter two number: ");
        scanf("%d%d",&x,&y);
        if(x==0 || y==0)
          printf("Please check the input and try again...\n");
    }while(x==0 || y==0);
    if(x>y)
         m=y;
    else
         m=x;

    for(i=m;i>=1;i--){
         if(x%i==0&&y%i==0){
             printf("\nGCD of %d and %d is %d",x,y,i) ;
             break;
         }
    }
    return 0;
}

Using Recursion

#include <stdio.h>

int gcd(int a, int b)
{

    if (a == b)
        return a;
    if (a > b)
        return gcd(a-b, b);
    return gcd(a, b-a);
}

int main()
{
    int x,y,m,i;
    do
    {
        printf("Enter two number: ");
        scanf("%d%d",&x,&y);
        if(x==0 || y==0)
          printf("Please check the input and try again...\n");
    }while(x==0 || y==0);
    printf("GCD of %d and %d is %d ", x, y, gcd(x, y));
    return 0;
}

   

Output
Enter two number: 0 99
Please check the input and try again...
Enter two number: 99 121

GCD of 99 and 121 is 11

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Find the Factorial of a number

Summary: Factorial is represented using '!', so five factorial will be written as (5!),n factorial as (n!).
n! = n*(n-1)*(n-2)*(n-3)...3.2.1 and zero factorial is defined as one i.e. 0! = 1.



Using While Loop

#include<stdio.h>
void main()
{
    int a,f,i;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=1;
    i=1;
    while(i<=a)
    {
        f = f * i;
        i++;
    }
     printf("\nFactorial of %d is: %d",a,f);
}

Using For Loop

#include<stdio.h>
void main()
{
    int a,f,i;
    printf("Enter a number: ");
    scanf("%d",&a);
    f=1;
    for(i=1;i<=a;i++)
        f = f * i;
     printf("\nFactorial of %d is: %d",a,f);
}

Using Recursion

#include<stdio.h>
int fact(int);
int main(){
 int num,f;

 printf("\nEnter a number: ");
 scanf("%d",&num);

 f=fact(num);

 printf("\nFactorial of %d is: %d",num,f);
 return 0;
}

int fact(int n){
 if(n==1)
  return 1;
 else
  return(n*fact(n-1));
}

   

Output

Enter a number: 5

Factorial of 5 is: 120

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Find the maximum occurrence of a character in a string

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

int main() {
   char str[20], ch;
   int count = 0, i,j=0 , max;
   int arr[10];
   printf("\nEnter a string : ");
   scanf("%s", &str);

   printf("\nEnter the character to be searched : ");
   scanf("%c", &ch);
   for (i = 0; str[i] != '\0'; i++) {
      if (str[i] == ch)
         count++;
      else if(count != 0)
      {
          arr[j] = count;
          j++;
          count = 0;
      }
   }
   arr[j]=count;
   max = 0;
       for(i=0;i<=j;i++)
        if(max<arr[i])
         max=arr[i];
   if (max == 0)
      printf("\nCharacter '%c'is not present", ch);
   else
   {
       printf("\nMaximum occurrence of character '%c' : %d", ch, max);
   }
   return (0);
}

   

Output

Enter a string : aabbbaaab

Enter the character to be searched :
Maximum occurrence of character 'a' : 3

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Accept Array elements

#include<stdio.h>
void main() {
   int arr[10], i, j, k, size;
   printf("\nEnter array size : ");
 scanf("%d", &size);

   printf("\nAccept Numbers : \n");
   for (i = 0; i < size; i++)
 {
 printf("Data [%d]: ",i+1);
 scanf("%d", &arr[i]);
 }

   printf("\nThe Array is : ");
   for (i = 0; i < size; i++)
 printf("%d ", arr[i]);

    getch();
}

   

Output

Enter array size : 5

Accept Numbers :
Data [1]: 2
Data [2]: 6
Data [3]: 7
Data [4]: 1
Data [5]: 2

The Array is : 2 6 7 1 2

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Print Pattern 5

#include <stdio.h>
void main()
{
    int i, j, k;
    for(i=5;i>=1;i--)
    {
 for(k=5;k>=i;k--)
        {
            printf(" ");
        }
        for(j=1;j<i;j++)
        {
            printf("*");
        }
        
 printf("\n");
    }
    getch();
}

   

Output

 ****
  ***
   **
    *

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Print Pattern 4

#include <stdio.h>
void main()
{
    int i, j, k;
    for(i=5;i>=1;i--)
    {
 for(j=1;j<=i;j++)
     printf("*");
 printf("\n");
    }
    getch();
}

   

Output
*****
****
***
**
*

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Print Pattern 3

#include <stdio.h>
void main()
{
    int i, j, k;
    for(i=5;i>=1;i--)
    {
        for(j=1;j<i;j++)
        {
            printf(" ");
        }
        for(k=5;k>=i;k--)
        {
            printf("*");
        }
 printf("\n");
    }
    getch();
}

   

Output

    *
   **
  ***
 ****
*****

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Print Pattern 2

#include <stdio.h>
void main()
{
    int i,j;
    for(i=1;i<=5;i++)
    {
 for(j=1;j<=i;j++)
 {
     printf("*");
 }
 printf("\n");
    }
    getch();
}

   

Output
*
**
***
****
*****

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Print Pattern 1

#include<stdio.h>
int main()
{
 int num,r,c;
 printf("Enter number of rows/columns: ");
 scanf("%d",&num);
 for(r=1; r<=num; r++)
 {
  for(c=1; c<=num; c++)
     printf("* ");
  printf("\n");
 }
 getch();
 return 0;
}

   

Output
Enter number of rows/columns: 5
* * * * *
* * * * *
* * * * *
* * * * *
* * * * *

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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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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 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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Print 1 to 10 using For Loop

#include<stdio.h>
int main()
{
 int x=1;
 
 for(x=1; x<=10; x++)
    printf("\n%d",x);

 return 0;
}

  

Output
  1
  2
  3
  4
  5
  6
  7
  8
  9
  10

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