int hoge(int n, int m){
    int i, sum = 0;

    if(n > m){
        int temp = n;
        n = m;
        m = temp;
    }

    for(i = n; i <= m; i++){
        sum += i;
    }
    return sum;
}
int main(){
printf("%d", hoge(4,8));
return(0);
}