Write a program to check a number is negative or positive?

Answer 1

#include<stdio.h>

int main() {

int num;

do {

scanf ("Enter a number (0 to exit): %d", num);

if (num>0)

printf ("The number is positive.\n");

else if (num<0)

printf ("The number is negative.\n");

else

printf ("The number is zero, neither positive nor negative\n");

} while (num);

return 0;

}

Answer 2

In fact, you also have to consider the case that a number is zero. But let's assume, for simplicity, that positive numbers, as well as zero, are allowed for a certain operation.

if myNumber >= 0
System.out.println("The number is valid.");

else
System.out.println("Negative numbers are not allowed.");

Or, simpler yet with the ternary operator:

System.out.println(myNumber >= 0 ? "The number is valid" : "Negative numbers are not allowed");

Answer 3

write a program to convert any positive number to negative number .

Answer 4

If the number is less than zero then it is negative, and if greater than 0 then it is positive. 0 is neither negative nor positive.

Answer 5

bool is_negative (int i) { return i<0; }