# C 程序：檢查給定的整數是正還是負 > 譯文： [https://beginnersbook.com/2015/02/c-program-to-check-whether-the-given-integer-is-positive-or-negative/](https://beginnersbook.com/2015/02/c-program-to-check-whether-the-given-integer-is-positive-or-negative/) 在下面的程序中，我們檢查輸入整數是正數還是負數。如果輸入數字大于零，則其為正數，否則為負數。如果數字為零則既不是正數也不是負數。我們在下面的 C 程序中遵循了相同的邏輯。 ```c /* Description: A program to check whether the input * integer number is positive or negative. * Written by: Chaitanya Singh * Published on: beginnersbook.com */ #include <stdio.h> void main() { int num; printf("Enter a number: \n"); scanf("%d", &num); if (num > 0) printf("%d is a positive number \n", num); else if (num < 0) printf("%d is a negative number \n", num); else printf("0 is neither positive nor negative"); } ``` 輸出 1： ```c Enter a number: 0 0 is neither positive nor negative ``` 輸出 2： ```c Enter a number: -3 -3 is a negative number ``` 輸出 3： ```c Enter a number: 100 100 is a positive number ```