freebsd-dev/contrib/top/prime.c

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/*
* Prime number generator. It prints on stdout the next prime number
* higher than the number specified as argv[1].
*/
#include <math.h>
main(argc, argv)
int argc;
char *argv[];
{
double i, j;
int f;
if (argc < 2)
{
exit(1);
}
i = atoi(argv[1]);
while (i++)
{
f=1;
for (j=2; j<i; j++)
{
if ((i/j)==floor(i/j))
{
f=0;
break;
}
}
if (f)
{
printf("%.0f\n", i);
exit(0);
}
}
}