# C Program to Find the Number of Integers Divisible by 3

In this program we will write code to find the number of integers which are divisible by 3 in the given range.

• Source Code

```/*
* C program to find the number of integers divisible by
* 3 between the given range n1 and n2. where n1 < n2.
*
* Also find the sum of all these integer numbers which are divisible
* by 3 and display the total.
*/
#include <stdio.h>

void main()
{
int i, n1, n2, count = 0, sum = 0;

printf("Enter the value of n1 and n2 \n");
scanf("%d %d", &n1, &n2);
/* Count the number and compute their sum*/
printf("Integers divisible by 3 are \n");
for (i = n1; i < n2; i++)
{
if (i % 3 == 0)
{
printf("%d,", i);
count++;
sum = sum + i;
}
}
printf("\n Number of integers divisible by 3 between %d and %d =
%d\n", n1, n2, count);
printf("Sum of all integers that are divisible by 3 = %d\n", sum);
}
```

• Runtime
```Case:1
Enter the value of n1 and n2
10 15
Integers divisible by 3 are 12,15
Number of integers divisible by 3 between 10 and 15 = 2
Sum of all integers that are divisible by 3 = 27

Case:2
Enter the value of n1 and n2
1 10
Integers divisible by 3 are
3,6,9
Number of integers divisible by 3 between 1 and 10 = 3
Sum of all integers that are divisible by 3 = 18```

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