编辑代码

#include <stdio.h>
void sum(int begin, int end);
int main() {
    sum(1,10);
    sum(20,30);
    sum(35,45);
    return 0;
}
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);
}