/*
this program sums integers from a to b, inclusive
composed by the 10.001 class
9/12/02
Defensive check for a < b, added after class...
-GCR
*/
#include < stdio.h>
int main(void)
{
int a,b,sum,temp;
/* step 1: get a and b from user*/
printf("input two integers, a and b\n");
scanf("%d %d",&a,&b);
/* step 2: check for a < b, swap if necessary: */
if(a > b) {
temp = a;
a = b;
b = temp;
}
/* step 3: prepare first part of output message, before a is changed */
printf("the sum from %d to %d is ",a,b);
/* step 4: initialize sum and loop until all values are added to it */
sum=a;
while(a < b)
{
sum=sum+a;
}
/*step 5: complete output message
(only works if no printf statements come between step 3 and step 5)*/
printf("%d\n",sum);
return(0);
}