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Well, the problem is here:

int port = *argv[2];

because port is an integer but argv[2] is actually a string.
Use atoi():


int port = atoi(argv[2]);

#include <stdio.h>
int main(void)
{
int i;
printf("enter a number: ");
scanf("%d", &i);
(i%2)&&printf("The number is odd\n");
(!(i%2))&&printf("The number is even\n");
return 0;
}