1-D array

#include <stdio.h>

int main()
{
int num[] = {2,8,7,6,0};
int i;

for(i=0;i<5;i++) {
    printf("\nArray Element of num[%d] : %d",i+1,num[i]);
}
    
return 0;
}



///different way

int  main()
{
     int arr[3],i;
     printf(“Enter 3 values:”);
     for(i=0;i<3;i++)
     {
          scanf("%d",&arr[i])
     }
     printf(“\nThe entered values are:”);
     for(i=0;i<3;i++)
     {
          printf("%d ",arr[i]);
     }
return 0;

}

Calculator by function

#include<stdio.h>

int add(int x, int y );
int sub(int a, int b );
int mult(int d, int e);
int div(int g, int h);

int main(){
int num1, num2, choice;

printf("[0] Exit\n[1] Addition\n[2] Subtraction\n[3] Multiplication\n[4] Division\n");
scanf("%d", &choice);

switch(choice){
    case 0:
        exit(0);
    case 1:
        printf("Enter 1st number:");
        scanf("%d", &num1);
        printf("\nEnter 2nd number:");
        scanf("%d", &num2);
        printf("\nThe addition is:%d\n", add( num1,num2));
        break;
    case 2:
        printf("Enter 1st number:");
        scanf("%d", &num1);
        printf("\nEnter 2nd number:");
        scanf("%d", &num2);
        printf("\nThe subtraction is:%d\n", sub(num1,num2));
        break;
    case 3:
        printf("Enter 1st number:");
        scanf("%d", &num1);
        printf("\nEnter 2nd number:");
        scanf("%d", &num2);
        printf("\nThe multiplication is:%d\n", mult(num1,num2));
        break;
    case 4:
        printf("Enter 1st number:");
        scanf("%d", &num1);
        printf("\nEnter 2nd number:");
        scanf("%d", &num2);
        printf("\nThe division is:%d\n", div(num1,num2));
        break;
    default:
        printf("\nInvalid choice!!!!!!!\n");
        break;
}
}
int add(int x,int y){
    int z;
    z = x + y;
    return z;
}

int sub(int a,int b){
    int c;
    c = a - b;
    return  c;
}

int mult(int d,int e){
    int f;
    f = d * e;
    return f;
    }

int div(int g,int h){
    int i;
    i = g / h;
    return i;
}

Swapping elements by function

#include<stdio.h>
///Swapping by function

void swap(int a, int b);

int main()
{
   int x, y;

   printf("Enter the value of x and y:");
   scanf("%d%d",&x,&y);

   printf("Before Swapping\nx = %d\ny = %d\n", x, y);

   swap(x,y);



   return 0;
}

void swap(int a, int b)
{
   int temp;

   temp = a;
   a   = b;
   b   = temp;
 printf("After Swapping\nx = %d\ny = %d\n", a, b);
}

Hello world

#include <iostream>

/***
using namespace std;

int main()
{
    cout << "Hello world!" << endl;
    return 0;
}

***/

/***

// my second program in C++
#include <iostream>
using namespace std;

int main ()
{
  cout << "Hello World! ";
  cout << "I'm a C++ program";
}
***/
/***

// my second program in C++
#include <iostream>

int main ()
{
  std::cout << "Hello World! ";
  std::cout << "I'm a C++ program";
}
***/

The value of EOF

#include <stdio.h>

int main(void)
{
printf("EOF == %d\n", EOF);

return 0;
}

output:

EOF = = -1

Sort a string

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

///sort a string

int main()
{
    char str[100],temp;
    int i,j;

    printf("Enter the string :");
    gets(str);

    for(i=0;i<strlen(str);i++)
    {
        for(j=i+1;j<strlen(str);j++)
        {
            if(str[j]<str[i])
            {
                temp=str[j];
                str[j]=str[i];
                str[i]=temp;
            }
        }
    }
    printf("\n------------------------------------\n");
    printf("\nThe sorted string is:%s\n",str);
     printf("\n------------------------------------\n");

    return 0;
}

Upper case letter to lower case letter

#include<stdio.h>
/***
int main()
{
 char a;


 printf("enter a character:");
 while(1){

 scanf("%c",&a);
  if(a==48)
    break;
 if(a>=65&&a<=90)
   printf("%c ",a+32);


}
return 0;
}

***/

#include<stdio.h>

int main(){

  char str[100];
  int i;

  printf("Enter any string:\n");
  scanf("%s",str);

  printf("\nThe string is:%s\n",str);

  for(i=0;i<strlen(str);i++){

      if(str[i]>=65&&str[i]<=90)
       str[i]=str[i]+32;
  }
  printf("\nThe Lower case string is:%s\n",str);
  return 0;
}

Common number in a array

#include<stdio.h>

int main()
{
    int i,j=5,a[4],n,count=0;

   

    for(i=0; i<4; i++)

        scanf("%d",&a[i]);

    for(i=0; i<4; i++)
    {
        printf("%d ",a[i]);

        if(a[i]==j)
        {
            count++;
        }
    }

    printf("\nNo 5 exist in this array %d times",count);

    return 0;

}

Least common multiple & greatest common divisor

#include<stdio.h>

/*** l.c.m and g.c.d ***/

int main()
{

  int num1,num2,x,y;

  printf("\nEnter two numbers:");
  scanf("%d %d",&num1,&num2);

  x=num1,y=num2;

  while(num1!=num2){
      if(num1>num2)
           num1=num1-num2;
      else
      num2=num2-num1;
  }
  printf("L.C.M=%d\nG.C.D=%d",x*y/num2,num1);
  return 0;
}

npr & ncr

#include<stdio.h>

///npr and ncr

int main()
{

    int n,r,ncr,npr;

    printf("Enter two numbers(n,r):");

    scanf("%d %d",&n,&r);

    ncr=fact(n)/(fact(r)*fact(n-r));

    npr=fact(n)/(fact(n-r));

    printf("\n---------------------------------------");

    printf("\nThe ncr and npr is:%dC%d=%d %dP%d=%d",n,r,ncr,n,r,npr);

    printf("\n---------------------------------------\n");

    return 0;
}
int fact(int n)
{

    int factorial=1,i;

for(i=1;i<=n;i++)
{


    factorial=factorial*i;

}
    return factorial;

}

output:

Enter two numbers(n,r):5 4

---------------------------------------

The ncr and npr is:5C4=5 5P4=120

---------------------------------------

We are in love

#include<stdio.h>
///simple loving program
///koushikahamed@yahoo.com

int main()
{
    system("color 1C");
    char a[100],b [100],approval[10],yes[10];


    printf("Please enter the boy name:");
    gets(a);

    printf("\nPlease enter the girl name:");
    gets(b);

    printf("\n%s Do you love %s ??\n",b,a);

    printf("\nplease don't be late!!!!!  %s is waiting\n",a);

    printf("\nexpress your feelings %s\n",b);

    printf("\nif you interested with %s type y/no\n",a);

    scanf("%s",approval);

    printf("\nif you love %s type y/no\n",a);

    scanf("%s",yes);

    strcpy(approval,yes);

    strrev(approval);

    if(strcmp(approval,yes)==0)
    {
    printf("\n<<<%s + %s>>> is a great couple>>>\n",a,b);
    printf("\n");

    printf(" .*'''*'''*:*'''*'''*;        \n");
    printf("  * %s+%s '''              \n",a,b);
    printf("   *              *            \n");
    printf("     *          *              \n");
    printf("       *      *                \n");
    printf("           *                   \n");


    }
    else if(strcmp(approval,yes)!=0)
        printf("\n%s and %s is not couple they are seems to be good friend>>>\n",a,b);

    return 0;
}

output:

Please enter the boy name:Romeo

Please enter the girl name:Juliet

Juliet Do you love Romeo ??

please don't be late!!!!!  Romeo is waiting

express your feelings Juliet

if you interested with Romeo type y/no

y

if you love Romeo type y/no

y

<<<Romeo + Juliet>>> is a great couple>>>

 .*'''*'''*:*'''*'''*;

 * Romeo+Juliet '

   *                    *

     *               *

       *        *

           *

Array reverse,summation ,average

#include<stdio.h>
#include<conio.h>
int main()
{
    int a[100],b[100],temp,i,j,n,sum=0;
    float avg;

    printf("How many numbers do you want in array:");
    scanf("%d",&n);

    puts("\nplease enter the number of array:");

    for(i=1; i<=n; i++)
    {
        scanf("%d",&a[i]);

        
}
    for(i=1; i<=n; i++)
    {
        printf("%d",&a[i]);

        sum=sum+a[i];

        avg=(float)(sum)/n;

    }
    puts("----------------------");

    printf("The sum  of the array is:%d",sum);

    puts("\n----------------------");

    printf("The average of the array is:%.2f",avg);

    puts("\n----------------------");

    puts("The reversed array is:");

    puts("----------------------");
    for(i=n; i>=1; i--)

    {
        printf("%d ",a[i]);
    }
    return 0;
}

output:

How many numbers do you want in array:5

please enter the number of array:
4 7 9 3 8
----------------------
The sum  of the array is:31
----------------------
The average of the array is:6.20
----------------------
The reversed array is:
----------------------

8 3 9 7 4

Pattern

#include<stdio.h>
///pattern
int main()
{
    int i,rows,n;
    char j;
    printf("Enter the number of rows: ");
    scanf("%d",&rows);
   
    for(i=65;i<=65+rows;i++)
    {
        for(j=65;j<i;j++)
        {
           printf("%c ",j);
        }
    printf("\n");
    }
    return 0;
}

output:

A

AB

ABC

ABCD

ABCDE

ABCDEF

ABCDEFG

ABCDEFGH

pattern-character

int main()
{
    int i,rows,n;
    char j;
    printf("Enter the number of rows: ");
    scanf("%d",&rows);
    printf("Enter how much number or char you will print: ");
    scanf("%d",&n);
    for(i=1;i<=rows;i++)
    {
        for(j=65;j<=n-1;j++)
        {
           printf("%c ",j);
        }
    printf("\n");
    n--;
    }
    return 0;
}
otuput:


 A B C D E F G H I J
A B C D E F G H I
A B C D E F G H
A B C D E F G
A B C D E F
A B C D E
A B C D
A B C
A B
A

series((1) + (1+2) + (1+2+3) + (1+2+3+4) + ... + (1+2+3+4+...+n))

#include<stdio.h>

///(1) + (1+2) + (1+2+3) + (1+2+3+4) + ... + (1+2+3+4+...+n)

int main()
{
    int i,j,n,sum=0;
    n=10;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=i;j++)
        {
            sum+=j;
        }
    }
    printf("Sum: %d",sum);
    return 0;
}

series(1+3+5+7+9+...........+n)

#include<stdio.h>
///odd number series:
int main ()
{
    int i,num,sum=0;
    printf("Please enter any number:");
    scanf("%d",&num);

    for(i=1;i<=num;i=i+2)
    {
      printf("%d ",i);
      sum=sum+i;
    }

    printf("\nThe sum of the odd number series is:%d",sum);

    return 0;
}

series(2+4+6+8+............+n)

#include<stdio.h>
///Even number series:
int main ()
{
    int i,num,sum=0;
    printf("Please enter any number:");
    scanf("%d",&num);

    for(i=2;i<=num;i=i+2)
    {
      printf("%d ",i);
      sum=sum+i;
    }

    printf("\nThe sum of the even number series is:%d",sum);

    return 0;
}

series(1/1 + 1/2 + 1/3 + 1/4 + . . . + 1/n----A.P)

#include<stdio.h>
///1/1 + 1/2 + 1/3 + 1/4 + . . . + 1/n
int main()
{

    float num,i,sum=0;

    printf("Please enter any number:\n");
    scanf("%f", &num);

    for (i=1;i<=num;i++)
    {
        sum=sum +(1/i);
        if (i==1)
            printf("\nThe series is: 1+");
        else if (i==num)
            printf("(1/%.0f)\n",i);
        else
            printf("(1/%.0f)+",i);
    }
    printf("\nThe sum of the series is:%.2f\n", sum);
    return 0;
}

series(1^3 + 2^3 + 3^3+ .....+n^3)

///1^3 + 2^3 + 3^3+ .....+n^3
int main(){

    int n,i;
    int sum=0;

    printf("Enter any end number of this series: ");
    scanf("%d",&n);

    sum = (((n*(n + 1) ) / 2))*(((n*(n + 1) ) / 2));

    printf("\nSum of the series:");

    for(i =1;i<=n;i++){
         if (i!= n)
             printf("%d^3+",i);
         else
             printf("%d^3=%d\n ",i,sum);
    }

    return 0;
}

series(1^2 + 2^2 + …. + n^2)

#include<stdio.h>
///1^2 + 2^2 + …. + n^2
int main(){

    int n,i;
    int sum=0;

    printf("Enter any end number of this series: ");
    scanf("%d",&n);

    sum = (n * (n + 1) * (2 * n + 1 )) / 6;

    printf("Sum of the series : ");

    for(i =1;i<=n;i++){
         if (i != n)
             printf("%d^2 + ",i);
         else
             printf("%d^2 = %d ",i,sum);
    }

    return 0;
}

series(1 + 2 + 3 + … + n)

#include<stdio.h>
///1 + 2 + 3 + … + n
int main(){

    int n,i;
    int sum=0;

    printf("Enter any end number of this series: ");
    scanf("%d",&n);

    sum = (n * (n + 1)) / 2;

    printf("Sum of the series: ");

    for(i =1;i <= n;i++){
         if (i!=n)
             printf("%d + ",i);
         else
             printf("%d=%d ",i,sum);
         }

    return 0;
}

Array(3)

#include <stdio.h>
///search a number using an arary using linear search.

int main()
{
int ara[100],i,key,n,loc,ck;
scanf("%d",&n);
for(i=0;i<n;i++)
    scanf("%d",&ara[i]);
    scanf("%d",&key);
    ck=0;
    for(i=0;i<n;i++){
      if (ara[i]==key){
        ck=1;
        loc=i+1;
        break;
      }
    }
    if (ck==1)
        printf("%d",loc);
    else
        printf("No");
        return 0;
}

Array(2)

#include <stdio.h>
///array traversing/array searching

int main()
{
int ara[5]={1,44,67,56,46},i;
///for(i=0;i<5;i++){
 ///   printf("%d ",ara[i]);
///}
///for(i=4;i>=0;i--){
   printf("%d ",ara[3]);
///}
return 0;
}

Array(1)

#include <stdio.h>
///array_declare

int main()
{
int ara[5]={1,2,4,6,99},i;
ara[0]=5;
ara[3]=66;

for(i=0;i<5;i++){
    printf("%d\n",ara[i]);
}
return 0;
}

string(11)

#include <stdio.h>
///string function:
///***strspn ,strcspn****

///int main()
///{
///char str1[100]="koushik";
///char str2[100]="kbcdef";
///int len;
///len=strspn(str1,str2);
///printf("%d\n",len);
///return 0;
///}



int main()
{
char str1[100]="koushik";
char str2[100]="abcdhf";
int len;
len=strcspn(str1,str2);
printf("%d\n",len);
return 0;
}

string(10)

#include <stdio.h>
#include <string.h>
///string (function)

///int main()
///{
///char str[100]="koushik";
///strlen(str);
///printf("%d\n",strlen(str));
///return 0;
///}


///int main()
///{
///char str1[100]="koushik";
///char str2[100]="Ahamed";
///strcpy(str1,str2);
///printf("%s\n",str1);
///return 0;
///}


///int main()
///{
///char str1[100]="koushik";
///char str2[100]="Ahamed";
///strncpy(str1,str2,3);
///str1[3]='\0';
///printf("%s\n",str1);
///return 0;
///}

///int main()
///{
///char str1[100]="koushik";
///char str2[100]="Ahamed";
///strcat(str1," ");
///strcat(str1,str2);
///printf("%s\n",str1);
///return 0;
///}

///int main()
///{
///char str1[100]="koushik";
///char str2[100]="Ahamedkushal";
///strncat(str1,str2,6);
///printf("%s\n",str1);
///return 0;
///}


///int main()
///{
///char str1[100]="BCD";
///char str2[100]="AYZ";
///strcmp(str1,str2);
///printf("%d",strcmp(str1,str2));
///return 0;
///}


///int main()
///{
///char str1[100]="BCD";
///char str2[100]="XYZ";
///strcmp(str1,str2);
///printf("%d",strcmp(str1,str2));
///return 0;
///}


///int main()
///{
///char str1[100]="BCD";
///char str2[100]="BCD";
///strcmp(str1,str2);
///printf("%d",strcmp(str1,str2));
///return 0;
///}


///int main()
///{
///char str1[100]="BCD";
///char str2[100]="BCD";
///if(strcmp(str1,str2)==0);
///printf("They are same\n");
///return 0;
///}


///int main()
///{
///char str1[100]="BCD";
///char str2[100]="BCD";
///if(!strcmp(str1,str2));
///printf("They are same\n");
///return 0;
///}


///int main()
///{
///char str1[100]="BBD";
///char str2[100]="BDB";
///strncmp(str1,str2,2);
///printf("%d",strncmp(str1,str2,2));
///return 0;
///}


///int main()
///{
///char str1[100]="BBD";
///char str2[100]="BBB";
///if(!strncmp(str1,str2,2));
///printf("They are same\n");
///return 0;
///}


int main()
{
char str1[100]="BBB";
char str2[100]="BBB";
printf("%d",strcoll(str1,str2));
return 0;
}

///***strcmp and strcoll closely same ***///

string(9)

#include <stdio.h>
#include <string.h>

int main()
{
char n1[100],n2[100];
while(scanf("%s%s",n1,n2) !=EOF){
  ///  if(strchr(n1)>strchr(n2))
    ///    printf("a > b \n");
   ///else if(strchr(n1)<strchr(n2))
     ///   printf("a < b \n");
   if(strlen(n1)>strlen(n2))
        printf("a > b \n");
   else if(strlen(n1)<strlen(n2))
        printf("a < b\n");
   else if(strcmp(n1,n2)==0)
   printf("a = b\n");
   else if(strcmp(n1,n2)>0)
   printf("a > b\n");
   else
       printf("a < b\n");

}
return 0;
}