C Program to calculate sum of ODD numbers till N
Get input n and calculate the sum of odd numbers till n
Sample Input 1:
5
Sample Output 1:
9(1+3+5)
Program or Solution
#include<stdio.h>
int main()
{
int n,i,sum=0;
printf("Enter a number:");
scanf("%d",&n);
for(i=1;i<=n;i=i+2)
{
sum=sum+i;
}
printf("The sum of first %d odd numbers: %d",n,sum);
return 0;
}
Program Explanation
Instruction(s) inside the for block{} are executed repeatedly till the second expression (i<=n) is true.
Here i is initialized to 1 and incremented by 2 for each iteration, instructions inside the for block are executed unless i becomes greater than n.
so value of i (1,3,5,...n)will be added to sum.
after adding all n odd numbers to sum, sum will be printed using printf statement.