program
#include <stdio.h>
#include <conio.h>
void main()
{
int a, sum = 0;
float avg;
printf("enter a value of a: ");
scanf("%d", &a);
for (int i = 0; i <= a; i++)
{
sum = sum + i;
avg = sum / a;
}
printf("sum of first %d natural number is %d \n", a, sum);
printf("average of first %d natural number is %.2f \n", a, avg);
getch();
}
OUTPUT
Enter a value of a: 45
The sum of the first 45 natural number is 1035
The average of the first 45 natural number is 23.00
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