What C is doing to us

Kuya and I were walking and talking about our debts to each other...

I owe him 71 pesos and so I gave him 100 pesos...

I forgot what is 100-71...
That was so funny and stupid at the same time. 

We really forgot even he does not know the answer. We looked for a claculator but we did not find anything. 

Generating a for loop to imitate a summation..


int num=100-71;
int i;
int sum;

for(i=0;i<=num;i++){
sum=sum+i;
}

printf("%d", sum);


Output: 29

We really generated a code but then after that we end up using the calculator function in his cellphone...

and got 29.

Stupid ne?