
c/c++ programming
hello guys,
here is my problem
#include<stdio.h>
main()
{
int a=2;
int b=9;
int c=1;
while(b)
{
if(odd(b))
c=c*a;
a=a*a;
b=b/2;
}
printf("%d\n",c);
}
How many times is c=c*a calculated?

Looks like C will be calculated twice. Since B is an int, and the assignment b=b/2 when b is origially 9 will result in 4.5, but because b is an int, the .5 is dropped off, and b is 4. And since 9 is odd, C is calculated and assigned. When b is 4, b is true and the while loop executes. It is not odd, however and does not caluclate C. When b=4/2, b is true, and b=2, which is even, thus C not calculated. After that b=2/2, b=1, which is true, and the while loop executes and since it 1 is odd, C is calculated again. Then b=1/2=.5, but just as was the case when b=9/2, b=4.5, the decimal part of an integer gets chopped off, and rounded downward. When b=1/2, it is rounded to 0 and this the while loop terminates. Hope this one helped.
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