main()
{
int x,y;
printf("Please input a integer:"); /*輸入壹個整數！*/
scanf("%d",x);
if(x<0)
printf("It's a negative number!"); /*輸入的數是負數！*/
else
printf("It's a positive number!"); /*輸入的數是正數！*/
y=x%2;
if(0==y)
printf("It's a even number!"); /*輸入的數是偶數！*/
else
printf("It's a odd number!"); /*輸入的數是奇數！*/
}
右邊的是註釋！