在下面的程序中，我们检查输入整数是正数还是负数。如果输入数字大于零，则其为正数，否则为负数。如果数字为零则既不是正数也不是负数。我们在下面的 C 程序中遵循了相同的逻辑。
/* 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");}输出 1：
Enter a number:00 is neither positive nor negative
输出 2：
Enter a number:-3-3 is a negative number
输出 3：
Enter a number:100100 is a positive number
