c - 大于和小于 C switch 语句

Question

我正在尝试编写具有大量比较的代码

Write a program in “QUANT.C” which “quantifies” numbers. Read an integer “x” and test it, producing the following output:

x greater than or equal to 1000 print “hugely positive”
x from 999 to 100 (including 100) print “very positive”
x between 100 and 0 print “positive”
x exactly 0 print “zero”
x between 0 and -100 print “negative”
x from -100 to -999 (including -100) print “very negative”
x less than or equal to -1000 print “hugely negative”

Thus -10 would print “negative”, -100 “very negative” and 458 “very positive”.

然后我尝试用switch语句来解决，但是没有用。我是否必须使用 if 语句来解决它，或者有一种方法可以使用 switch 语句来解决它？

#include <stdio.h>

int main(void)
{
    int a=0;
    printf("please enter a number : \n");

    scanf("%i",&a);

    switch(a)
    {
        case (a>1000):
            printf("hugely positive");
            break;

        case (a>=100 && a<999):
            printf("very positive");
            break;

        case (a>=0 && a<100):
            printf("positive");
            break;

        case 0:
            printf("zero");
            break;

        case (a>-100 && a<0):
            printf("negative");
            break;

        case (a<-100 && a>-999):
            printf("very negative");
            break;

        case (a<=-1000):
            printf("hugely negative");
            break;

    return 0;
}

Answer 1

没有干净的方法可以用 switch 解决这个问题，因为 case 需要是整数类型。看看 if-else if-else。