#include <stdio.h>

int main()
{
    int i,j,n;
    

    printf("Enter number: ");  //to accept  number from user
    scanf("%d",&n);
    

    for(i=1;i<=n;i++) //outer loop is used to print rows
    {
        

        for(j=n;j>=i;j--)  // inner loop is used to print columns
        {
            printf("* ");   //to print *
        }
        

        printf("\n");  // for  go to the next line
    }
    

    return 0;
}

/*

                             1
                             1  2
                             1  2  3                                                                         

*/

#include<stdio.h>

int main()
{
    int i,j,n;
    printf("Enter number: "); // To accept number from user
    scanf("%d",&n);
   

    //outer for loop is used to print rows and the inner loop is used to print columns
    

     for(i=1;i<=n;i++)  //outer loop
    {
        for(j=1;j<=i;j++)  //inner loop
        {
            printf("%d ",j);
        }
        printf("\n");   //for go to the next line
    }
    

    return 0;
}

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

//all variables declared globally
int a[20][20],i,j,r,c,ch,sum; // a=2d array , r= rows , c=columns ch=choice sum=sum of odd element

//accept rows and columns
void Accept()
   {
      printf("\nEnter number of rows:");
      scanf("%d",&r);
      printf("\nEnter number of columns:");
      scanf("%d",&c);

       //to accept array
      for(i=0;i<r;i++)
      {
      for(j=0;j<c;j++)
         {
          printf("\nEnter elements : ");
            scanf("%d",&a[i][j]);
         }
      }
   }

//to display array
   void display()
   {
     for(i=0;i<r;i++)
      {
      for(j=0;j<c;j++)
         {
          printf("%d ",a[i][j]);
         }
          printf("\n");
      }
   }

//to tranpose given array
   void transpose()
   {
      for(i=0;i<r;i++)
      {
      for(j=0;j<c;j++)
         {
          printf("%d ",a[j][i]);
         }
         printf("\n");
      }
   }

//to calculate sum of all odd  array elements
   void sumofoddnumber()
   {
      sum=0;
      for(i=0;i<r;i++)
      {
      for(j=0;j<c;j++)
         {
          if(a[i][j]%2!=0)
            {
            sum=sum+a[i][j];
            }
         }
      }
      printf("Sum of all odd elements : %d\n",sum);
   }

void main()
{
    do
    {
    //to create menu     
   printf("\n1)Accept matrix\n2)Transpose of matrix\n3)sum of all odd elements of matrix\n4)Exit\nEnter choice: ");
        scanf("%d",&ch);
        switch(ch)
        {
            case 1:Accept();display();break;
                case 2:transpose();break;
                case 3:sumofoddnumber();break;
        }
    }while(ch!=4);
}

#include<stdio.h>

#include<conio.h>

int main()

{

int n,i; //n=number

   //accept number

printf("\nEnter number : ");

   scanf("%d",&n);

   //calculate and printing table

   for(i=1;i<=10;i++)

   {

      printf("%d * %d = %d\n",n,i,i*n);

   }

   getch();

   return(0);

}

#include<stdio.h>

#include<conio.h>

void main()

{

   int x,y,i,ans;//ans=value of x^y

   //Accept values of x and y

   printf("\nEnter value of x : ");

   scanf("%d",&x);

   printf("\nEnter value of y : ");

   scanf("%d",&y);

   ans=1; //initialize ans=1

   //calclate x^y

   for(i=1;i<=y;i++)

   {

    ans=ans*x;

   }

   //printing result

   printf("\nvalue of x^y : %d",ans);

   getch();

}

#include<stdio.h>

#include<conio.h>

//calculate the arithmetic mean and harmonic mean

void calculation(int a,int b)

{

   float AM, HM; // AM=Arithmetic Mean , HM=Harmonic Mean

   AM=float((a+b))/2; // Formula AM= (a+b)/2

   HM=a*b/float((a+b)); // Formula HM = ab/(a+b)

   //To display Arithmetic Mean & Harmonic Mean

   printf("\nArithmetic Mean is : %f",AM);

   printf("\nHarmonic Mean is   : %f",HM);

}

//swapping of 2 numbers

void swap(int a, int b)

{

int temp;

   printf("\nbefore swapping of 2 numbers : \na = %d\nb = %d",a,b);

   temp=a;

   a=b;

   b=temp;

   printf("\nAfter swapping of 2 numbers  : \na = %d\nb = %d",a,b);

}

void main()

{

   int a,b,ch;

   //Accept 2 numbers

   printf("\nEnter the 1st number: ");

   scanf("%d",&a);

   printf("\nEnter the 2nd number: ");

   scanf("%d",&b);

   //create menu

   do{

    printf("\n\n********menu********\n");

    printf("\n1.Swap 2 numbers\n2.Calculate Arithmatic mean and harmonic mean\n3.Exit\nEnter your choice: ");

      scanf("%d",&ch);

      switch(ch)

      {

       case 1:swap(a,b);break;

         case 2:calculation(a,b);break;

      }

   }while(ch!=3);

}

#include<stdio.h>

#include<conio.h>

void main()

{

int n,r,sum;  //n=number, r=remainder, sum=sum of digits

   //accept number from user

   printf("\nEnter number: ");

   scanf("%d",&n);

   sum=0; //initialize value of sum=0

   //separate each digit from number and add it in sum variable

   while(n!=0)

   {

    r=n%10;

      sum=sum+r;

      n=n/10;

   }

   //printing result

   printf("sum is : %d",sum);

   getch();

}

#include<stdio.h>

#include<conio.h>

void convert(int, int);

int main()

{

        int num;

        //accept value from user

        printf("Enter a positive decimal number : ");

        scanf("%d", &num);

        printf("\nBinary number : ");

        convert(num, 2); //calling convert()

        printf("\n");

        printf("\nOctal number : ");

        convert(num, 8); //calling convert()

        printf("\n");

        printf("\nHexadecimal number : ");

        convert(num, 16); //calling convert()

        printf("\n");

        getch();

        return 0;

}

void convert (int num, int base)

{

        int rem = num%base; //rem=remainder

        if(num==0)

                return;

        convert(num/base, base); //recursion

        //printing values

        if(rem < 10)

                printf("%d", rem);

        else

                printf("%c", rem-10+'A' );

}

#include<stdio.h>

#include<conio.h>

void main()

{

int n,r,s;//n=number, r=remainder, s=sum

   //accept value of x from user

   printf("\nEnter value of n: ");

   scanf("%d",&n);

   // to make number reverse eg= 152: 251

   while(n!=0)

   {

      r=n%10;

      s=s*10+r;

    n=n/10;

   }

   //get single digit from reverse print in words

   while(s!=0)

   {

      r=s%10;

      s=s/10;

      switch(r)

      {

      case 1:printf("one");break;

      case 2:printf("two");break;

      case 3:printf("three");break;

      case 4:printf("four");break;

      case 5:printf("five");break;

      case 6:printf("six");break;

      case 7:printf("seven");break;

      case 8:printf("eight");break;

      case 9:printf("nine");break;

      default:printf("zero");break;

      }

      if(s!=0)

      printf("-");

   }

   getch();

}

#include<stdio.h>

#include<conio.h>

void main()

{

float x,y;

   //accept x and y values from user

   printf("\nEnter value of x: ");

   scanf("%f",&x);

   printf("\nEnter value of y: ");

   scanf("%f",&y);

//check in which quadrant points are belong

   if(x>0&&y>0)

   {

    printf("\nPoints are belongs in I quadrant.");

   }

   if(x<0&&y<0)

   {

    printf("\nPoints are belongs in III quadrant.");

   }

   if(x<0&&y>0)

   {

    printf("\nPoints are belongs in II quadrant.");

   }

   if(x>0&&y<0)

   {

    printf("\nPoints are belongs in IV quadrant.");

   }

   getch();

}

#include<stdio.h>

#include<conio.h>

   //To calculate area of square

void square()

   {

    float length,Area_of_square;

      printf("\nEnter length: ");

      scanf("%f",&length);

      Area_of_square=(length*length);

      printf("\nArea of square: %f",Area_of_square);

   }

   //To calculate Area of Rectangle

   void rectangle()

   {

    float length,breadth,Area_of_Rectangle;

      printf("\nEnter length of rectangle: ");

      scanf("%f",&length);

      printf("\nEnter breadth: ");

      scanf("%f",&breadth);

      Area_of_Rectangle=length*breadth;

      printf("\nArea of Rectangle: %f",Area_of_Rectangle);

   }

   //To calculate Area of triangle

   void triangle()

   {

      float height,base,Area_of_triangle;

      printf("\nEnter height: ");

      scanf("%f",&height);

      printf("\nEnter base: ");

      scanf("%f",&base);

      Area_of_triangle=(height*base)/2;

      printf("\nArea of triangle: %f",Area_of_triangle);

   }

void main()

{

   int ch; //ch=choice

do

   {

    //To display menu

    printf("\n1) Area of Square\n2) Area of Rectangle\n3) Area of triangle\n4) Exit.\nEnter choice : ");

    scanf("%d",&ch);

      switch(ch)

      {

      case 1:square();break;

         case 2:rectangle();break;

         case 3:triangle();break;

      }

   }while(ch!=4);

}

#include<conio.h>

#include<stdio.h>

void main()

{

   int no,i,sum;//no=number, sum=sum of divisor

   //accept number

   printf("\nEnter any number: ");

   scanf("%d",&no);

   sum=0;

   //check divisors of n

   for(i=1;i<no/2;i++)

   {

    if(i%2==0)

      {

      sum=sum+no;

      }

   }

   //to check original number and sum of divisor till given number

   if(sum==no)

   {

    printf("\n%d is Perfect Number.",sum);

   }

   else

   {

    printf("\n%d is not Perfect Number.",no);

   }

   getch();

}

#include<conio.h>

#include<stdio.h>

void main()

{

   //no=number,even=total number of even number in no, odd=Total number of odd number in no

   //zero=Total number of zero in no, rem=remainder

   int no,even,odd,zero,rem;

   

   //accept value of n

   printf("\nEnter any number: ");

   scanf("%d",&no);

   odd=0;

   even=0;

   zero=0;

   //To find separate each digit in a number and check digit is even, odd or zero

   while(no!=0)

   {

    rem=no%10;

      no=no/10;

      if(rem==0)

      {

          zero++;  //if number is zero then increment it by 1

      }

      else if(rem%2==0)

      {

      even++;  //if number is even then increment it by 1

      }

      else if(rem%2!=0)

      {

      odd++;  //if number is odd then increment it by 1

      }

   }

   //printing a result

   printf("\nTotal number of zero = %d",zero);

   printf("\nTotal number of even = %d",even);

   printf("\nTotal number of odd  = %d",odd);

   getch();

}

#include<conio.h>

#include<stdio.h>

void main()

{

   int no,sum,rem,n;//no=number,sum=sum of cube of each digit in no,rem=remainder, n=copy of no

   //accept value of n

   printf("\nEnter any number: ");

   scanf("%d",&no);

   n=no;//n is copy of number

   sum=0;

   //To find the sum of cubes of each digit in a number

   while(no!=0)

   {

    rem=no%10;

      sum=rem*rem*rem+sum;

      no=no/10;

   }

   //if n is similar to the sum of cubes of each digit in given number then it is Armstrong number

   if(n==sum)

   {

    printf("%d is armstrong number.",sum);

   }

   else

   {

    printf("%d is not armstrong number.",sum);

   }

   getch();

}

#include<conio.h>

#include<stdio.h>

void main()

{

int n,i,sum;   //n=no of odd numbers , sum= to get sum of all odd number till n

   //Accept value of n

   printf("\nEnter value of n: ");

   scanf("%d",&n);

   sum=0;//initialize value of sum

   for(i=1;i<=n;i++)

   {

    if(i%2!=0)

      {

      sum=sum+i;  //to add every odd numbers till n in sum variable

      }

   }

   //printing a result

   printf("\nSum of all odd numbers till %d = %d",n,sum);

   getch();

}

#include<stdio.h>

#include<conio.h>

   //To calculate area of circle

void area()

   {

    float radius,area_of_circle;

      printf("\nEnter radius of circle: ");

      scanf("%f",&radius);

      area_of_circle=(3.142*radius*radius);

      printf("\nArea of Circle: %f",area_of_circle);

   }

   //To calculate Circumference of circle

   void circumference()

   {

    float radius,circumference_of_circle;

      printf("\nEnter radius of circle: ");

      scanf("%f",&radius);

      circumference_of_circle=2*3.142*radius;

      printf("\nCircumference of Circle: %f",circumference_of_circle);

   }

   //To calculate Volume of sphere

   void volume()

   {

      float radius,volume_of_sphere;

      printf("\nEnter radius of sphere: ");

      scanf("%f",&radius);

      volume_of_sphere=4/3*3.142*radius*radius;

      printf("\nVolume of Sphere: %f",volume_of_sphere);

   }

void main()

{

   int ch; //ch=choice

do

   {

    //To display menu

    printf("\n1) Area of Circle\n2) Circumference of Circle\n3) Volume of Sphere\n4) Exit.\nEnter choice : ");

    scanf("%d",&ch);

      switch(ch)

      {

      case 1:area();break;

         case 2:circumference();break;

         case 3:volume();break;

      }

   }while(ch!=4);

}

#include<stdio.h>

#include<conio.h>

void main()

{

int cp,sp; //cp=cost price, sp=selling price

   float profit,loss;

   //accept cost price and cost price

   printf("\nEnter cost price: ");

   scanf("%d",&cp);

   printf("\nEnter selling price: ");

   scanf("%d",&sp);

   //check selling price is greater than cost price or not

   if(sp<cp)

   {

    loss=(cp-sp);

    printf("\nSeller has made loss");

      printf("\nloss = %f Rs.",loss);

   }

   else if(sp>cp)

   {

    profit=(sp-cp);

    printf("seller has made profit");

      printf("\nprofit= %f Rs.",profit);

   }

   else

   {

    printf("seller has made nor profit nor loss");

   }

   getch();

}

#include<stdio.h>

#include<conio.h>

int main()

{

int a,b,i,j;

   //accept starting number and ending number

printf("\nEnter starting number: ");

   scanf("%d",&a);

   printf("\nEnter ending number: ");

   scanf("%d",&b);

   //printing starting table till ending table

   for(i=a;i<=b;i++)

   {

    for(j=1;j<=10;j++)

      {

      printf("%d\n",i*j);

      }

      printf("\n\n");

   }

   getch();

   return(0);

}

#include<stdio.h>

#include<conio.h>

#include<string.h>

int main()

{

//declaration of character

char ch[10];

   //accept character

   printf("\nEnter any character: ");

   gets(ch);

   //compare 2 characters using strcmp function()

   //The strcmp() function is used to compare two strings two strings

   if(strcmp(ch,"a")==0||strcmp(ch,"A")==0)

   {

    printf("\ncharacter is vowel.");

   }

   else if(strcmp(ch,"e")==0||strcmp(ch,"E")==0)

   {

    printf("\ncharacter is vowel.");

   }

   else if(strcmp(ch,"i")==0||strcmp(ch,"I")==0)

   {

    printf("\ncharacter is vowel.");

   }

   else if(strcmp(ch,"o")==0||strcmp(ch,"O")==0)

{

    printf("\ncharacter is vowel.");

   }

   else if(strcmp(ch,"u")==0||strcmp(ch,"U")==0)

{

    printf("\ncharacter is vowel.");

   }

   else

   {

    printf("\ncharacter is consonant.");

   }

   return(0);

getch();

}

#include<stdio.h>

#include<stdlib.h>

int main()

{

//declaration of 2 matrix a and b

       //r=rows , c=columns

int a[10][10],b[10][10],mul[10][10],r,c,i,j,k;

   //accept rows and columns

printf("\nEnter the number of rows: ");

scanf("%d",&r);

printf("\nEnter the number of columns: ");

scanf("%d",&c);

   //accept 1st matrix

for(i=0;i<r;i++)

{

for(j=0;j<c;j++)

{

      printf("\nEnter %d element: ",i+1);

scanf("%d",&a[i][j]);

}

}

   //accept 2nd matrix

printf("\nEnter the elements of second matrix \n");

for(i=0;i<r;i++)

{

for(j=0;j<c;j++)

{

      printf("\nEnter %d element: ",i+1);

scanf("%d",&b[i][j]);

}

}

   //multiplication of 2 matrix

printf("\nMultiplication of the matrix:\n");

for(i=0;i<r;i++)

{

for(j=0;j<c;j++)

{

mul[i][j]=0;

for(k=0;k<c;k++)

{

mul[i][j]+=a[i][k]*b[k][j];

}

}

}

//for printing multiplication matrix

for(i=0;i<r;i++)

{

for(j=0;j<c;j++)

{

printf("%d\t",mul[i][j]);

}

printf("\n");

}

return 0;

}