#include <stdio.h>
void sum(int begin, int end)
{
    int i; 
    int sum = 0;
    for( i=begin; i<=end; i++){
        sum += i;
    }
    printf("%d到%d的和是%d\n", begin, end, sum);
}
int main () 
{
    sum(1, 10);
    sum(20,30);
    sum(35,45);
    return 0;
}