Program to calculate sum of odd number series using while loop in C.

Code Box
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/*program to calculate sum of the series 
1+3+5+7+9.......+n
odd number series
where n is the limit entered by user.
*/

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

clrscr();

sum=0;

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

printf("\nOdd Number Series ");

printf("\nSeries= ");

i=1;                      //initialization 
while(i<=num)      //test condition 
{

if(i%2!=0)            //% modulus operator  
{
printf(" + %d ",i);
sum=sum+i;
}
i++;                   //increment post fix operator
}
printf("\n\nSum of series= %d",sum);

getch();
}

Program to calculate sum of the odd number series using for loop in C.

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

/*program to calculate sum of the series 
1+3+5+7+9.......+n
odd number series
where n is the limit entered by user.
*/

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

clrscr();

sum=0;

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

printf("\nOdd Number Series ");

printf("\nSeries= ");
for(i=1;i<=num;i++)
{

if(i%2!=0)
{
printf(" + %d ",i);
sum=sum+i;
}

}
printf("\n\nSum of series= %d",sum);

getch();
}