Thread: circular shift

ok, im trying to write a function that does a "circular shift" i.e: left shifts "a" by "n" positions, where high order bits are introduced as low order bits.

eg:

10000001 circular shift 1 yeild = 00000011
01101011 circular shift 3 yields = 01011011

heres my code so far...it shifts but does set do the circular thing:

#include <stdio.h>

int circular_shift(int a, int n);

int main(void)
{
int num, yeilds;
char numstring[81];

printf("Enter a number:\n");
gets(numstring);
num = atoi(numstring);

printf("Enter the number of shift yields:\n");
gets(numstring);
yeilds = atoi(numstring);

circular_shift(num, yeilds);

getch();
return 0;
}
int circular_shift(int a, int n)
{
int circular, result, i;

result = a << n;

for(i =1; i<= 8; i++)
{
printf("%d", (result & 0x0080) !=0);

result <<=1;
}
}

>for(i =1; i<= 8; i++)
>{
>printf("%d", (result & 0x0080) !=0);
in tc 2.0 sizeof(int) is 2, in gcc it is 4,so replace it with:

for(i =1; i<= sizeof(result)*8; i++)
{
printf("%d", (result & (1<<(sizeof(result)*8-1))) !=0);

thanks for that..works perfectly.