For Loop Tricks Difference

Code:

#include<stdio.h>
int main()
{
    int n,sum,i;
    printf("Enter here:");
    scanf("%d",&n);
    sum=0;
    for(i=1; i<=n; sum=sum+i,i++)

        printf("%d\n",sum);

    return 0;
}

output:

Enter here:5
0
1
3
6
10

another :

#include<stdio.h>
int main()
{
    int n,sum,i;
    printf("Enter here:");
    scanf("%d",&n);
    sum=0;
    for(i=1; i<=n+1; sum=sum+i,i++)

        printf("%d\n",sum);

    return 0;
}

output:

Enter here:5
0
1
3
6
10
15

another code smart for loop : 😀

#include<stdio.h>
int main()
{
    int n,sum,i;
    printf("Enter here:");
    scanf("%d",&n);

    for(sum=0,i=1; i<=n; sum+=i,i++);  //it is smart loop because everything is here and it is doing comma operator from left to right precedence

        printf("sum of %d natural number is %d\n",n,sum);

    return 0;
}

output:

Enter here:5
sum of 5 natural number is 15