### Program 11:Sum of all integers divisible by 2 between two numbers

Program 11:

```#include<stdio.h>
main()
{
int i,sum=0,num1,num2;
printf("Enter Number1\n");
scanf("%d",&num1);
printf("Enter Number2\n");
scanf("%d",&num2);
for(i=num1;i<=num2;i++)
{
if(i%2==0)
{
sum+=i;
}
}
printf("The sum of all integers between %d and %d is %d\n",num1,num2,sum);
}```
Explanation:
1. We initialized
• i---->to use in for loop.
• num1-->to store 1st number.
• num2-->to store 2nd number.
• sum---->to store the sum of all integers that are divisible by 2.
2. We took the number 1 and 2 from user.(let us take num1=1 and num2 =10)
3. Now we enter the loop where i=num1-->1 and i<=num2-->10.
• Loop 1:
• i=1 and as i<=10 the loop executes
• then as i%2 (i.e. 1%2) is 1 so the if statement won't execute keeping sum =0
• Now the value of i is incremented by 1.Therefore, i=2.
• Loop 2 now i = 2
• i=2 and as i<=10 the loop executes
• then as i%2 (i.e. 2%2) is 0 so the if statement will execute.
• As sum+=i(i.e. same as sum=sum+i). Therefore, sum=0+2=2.
• Now the value of i is incremented by 1.Therefore, i=3.
• Loop 3 now i=3
• i=3 and as i<=10 the loop executes
• then as i%2 (i.e. 1%2) is 1 so the if statement wont execute keeping sum =2
• Now the value of i is incremented by 1.Therefore, i=4.
• Loop 4 now i=4
• i=4 and as i<=10 the loop executes
• then as i%2 (i.e. 4%2) is 0 so the if statement will execute.
• As sum+=i(i.e. same as sum=sum+i).Therefore, sum=2+4=6.
• Now the value of i is incremented by 1.Therefore, i=5.
• This continues till i becomes 10 where
• When i=5 , i%2=>5%2=1 which is not 0 so sum remains same which is 6.
• When i=6,sum=6+6=12
• When i=7, if statement will not execute so sum remains 10.
• When i=8, sum=12+8=20
• When i=9,sum remains same as 20.
• When i=10 ,sum=20+10=30.
• In this way it will execute till i=10 after that as i becomes 11 the loop terminates.
• Then the value in sum is printed which is 30 in this case.
Output:

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 Compiler Used by me C-Free 5.0(Recommended) Other Compilers Code Blocks(Recommended) Online Compilers Ideone(Remember to give input before executing online where ever necessary)