Inserting elements into integer array in C

/*Program to create an integer array and printing
elements of array*/

#include<conio.h>
void main()
{
int a[10],i;
clrscr();
printf("\nEnter 5 numbers:\n");

//inserting elements in array
for(i=0;i<5;i++)
{
printf("\nElement %d =>",i+1);
scanf("%d",&a[i]);
}

//printing elements in array
printf("\nElements in array:");
for(i=0;i<5;i++)
{
printf("\nElement %d =>",i+1);
printf("%d",a[i]);
}
getch();
}

-------------------------------------------------------------------------
Explanation:
--------------------------------------------------------------------------
In above program we have created an array of integer type with size(maximum 10) so our system
automatically index it as...

And we are inserting values using for loop with loop variable i=0 to i<5
that means 5 values  0, 1, 2, 3, 4.

Similarly after successful inserting values into array we are printing those values using again another
for loop.
--------------------------------------------------------------------------------------------------------------------------

Program to find reverse of a number by for loop in C.

Code Box 
-------------------------------------------------

/*Program to find reverse of a number by for loop in C*/

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

void main()
{
int num,num1,len,rem,newnum;
clrscr();

newnum=0;

printf("\n\tReverse Number maker");
printf("\n-------------------------");
printf("\nEnter a number:");
scanf("%d",&num);

num1=num; //to save actual number

for(len=0;num1>=1;len++)
{
rem=num1%10;
num1=num1/10;
newnum=newnum*10+rem; //Reverse formula 
}

printf("\nReverse of number is : %d",newnum);

getch();

} 

Program to print number pattern using for loop in C.(Pattern 3)

Code Box
----------------------------------

/*program to print star pattern square box by for loop

  1
  22
  333
  4444
  55555

*/

#include<stdio.h>
#include<conio.h>
void main()
{
int n,i,j;
i=1;
clrscr();

printf("\nEnter value of n :");
scanf("%d",&n);

for(i=1;i<=n;i++)
{
        for(j=1;j<=i;j++)
        {
        printf("%d",i);
        }

printf("\n");

}

getch();

}


--Explanation--------------------------------------

Program to calculate sum of series using for loop without power function in C.

Code Box
--------------------------------------

/*Program to calculate sum of series

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

 where n is the value entered by user.

 =>Explicit type conversion

*/

#include<stdio.h>
#include<conio.h>
void main()
{
int i,n;
float sum;
clrscr();
sum=0;

printf("\nEnter limit number : ");
scanf("%d",&n);


printf("\nSeries=");

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

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

printf(" +1/(%d*%d) ",i,i);
sum=sum+(float)1/(i*i); //Explicit type conversion

}

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

printf("\nSum of series= %.3f",sum);

getch();
}

Program to print table of any input number using for loop in C.

Code Box
---------------------------------------------
/*Program to print table of any input number*/

#include<stdio.h>
#include<conio.h>
void main()
{
int num,i,mul;
clrscr();

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

clrscr();  //for clear screen

printf("\n-------------------------------");
printf("\nNumber entered is: %d",num);
printf("\n-------------------------------");
printf("\nTable of %d is",num);
printf("\n---------------------------------------\n");

for(i=1;i<=10;i++)
{
if(num==0)
{
printf("\nZero entered");
break;
}
mul=num*i;
printf("\n %d x %d = %d ",num,i,mul);
//print in format num x i=mul
}

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

getch();
} 

Program to enter multiple values using while loop and calculate sum of all numbers in C.

Code Box
---------------------------------------

/*Program to enter multiple values using while loop and calculate sum of all numbers */

#include<stdio.h>
#include<conio.h>
void main()
{
int num,i,sum,val;
clrscr();

sum=0;

printf("\nEnter numbers you want to enter:");
scanf("%d",&num);

i=1;while(i<=num)
{
printf("\nEnter %d value= ",i);
scanf("%d",&val);

sum=sum+val;

printf("\nSum is= %d",sum);

i++;
}

printf("\nTotal Sum= %d",sum);

getch();
}

Write a program to enter multiple values using for loop and calculate sum of all numbers in C.

Code Box
---------------------------------------

/*Program to enter multiple values using for loop and calculate sum of all numbers */

#include<stdio.h>
#include<conio.h>
void main()
{
int num,i,sum,val;
clrscr();

sum=0;

printf("\nEnter numbers you want to enter:");
scanf("%d",&num);

for(i=1;i<=num;i++)
{
printf("\nEnter %d value",i);
scanf("%d",&val);

sum=sum+val;

printf("\nSum is= %d",sum);

}

printf("\nTotal Sum= %d",sum);

getch();
}

Program to delete an element from list in C.

Code Box
-------------------------------------------

/* Program to delete an element from list
*/
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,l,k,ins,temp,n,del,pos;
int num[50];
clrscr();

printf("\nEnter List Size(max 50):");
scanf("%d",&n);
printf("\nEnter elements :");
for(i=0;i<n;i++)
{
scanf("%d",&num[i]);
}

clrscr();
printf("\nElements in list :");
for(i=0;i<n;i++)
{
printf(" %d",num[i]);
}
printf("\nSelect :\n1.for insert into list\n2.for delete from list :");
scanf("%d",&l);
switch(l)
{
case 1:

printf("\nEnter element :");
scanf("%d",&ins);
printf("\nPosition :");
scanf("%d",&pos);
pos=pos-1;
n=n+1;
for(i=pos;i<n;i++)
{ temp=num[i];
  num[i]=ins;
  ins=temp;
}

break;

case 2:

printf("\nSelect \n1.To enter number for delete\n2.for position of number :");
scanf("%d",&j);
switch(j)
{
case 1:
printf("\nEnter element :");
scanf("%d",&del);
for(i=0;i<n;i++)
{
if(num[i]==del)
{for(k=i+1;k<n;k++)
 {
  num[k-1]=num[k];
 }
}
}
break;

case 2:
printf("\nPosition :");
scanf("%d",&pos);
pos=pos-1;
for(i=pos;i<n;i++)
{
num[i]=num[i+1];
}
break;

default :
printf("\nerror:check entry!!!!");
}
n=n-1;

break;
default :
printf("\nerror:check entry!!!!");

}

printf("\nElements in new list :");
for(i=0;i<n;i++)
{
printf(" %d",num[i]);
}

getch();
}

Program to find L.C.M. of any two numbers in C.

Code Box
---------------------------------------
/*Program to find L.C.M. of any two numbers */

#include<stdio.h>
#include<conio.h>
void main()
{
clrscr();
int num1,num2,a,b,count,lcm,i;
lcm=1;

printf("\n----------------- L.C.M. Calculator ---------------");
printf("\nEnter first number:");
scanf("%d",&a);
printf("\nEnter second number:");
scanf("%d",&b);

num1=a;
num2=b;

//prime factors are 2,3,5,7
printf("L.C.M. Factors :");
for(i=7;i>=2;)
{
count=0;

if(num1%i==0)
{
num1=num1/i;
count=1;
}

if(num2%i==0)
{
num2=num2/i;
count=1;
}

if(count==0)
{
i--;
}
else
{
printf("%d",i);
lcm=lcm*i;
}
}

//in case of prime number
printf("  %d  %d ",num1,num2);
lcm=lcm*num1*num2;

printf("\nL.C.M. of %d & %d is : %d",a,b,lcm);
printf("\n\n-------------------------------------------");
getch();
}