Question

Programming in C (not C++)

Write the function definition for a function called CompareNum that takes one doyble argument called "num". The function will declare, ask, and get another double from the user. Compare the double entered by the user to "num" and return a 0 if they are the same, a -1 num is less than the double entered by the user and 1 if it is greater.

Answer 1

Function defnition and the complete program are given below.Detailed comments are included for better under standing the code.Screen shot of the code and output are also attached.if find any difficulty,feel free to ask in comment section.Please do upvote the answer.Thank you

Function definition

int compareNum(double num)
{
   //declaring double variable number
   double number;
   //prompt user to enter number
   printf("Enter a number: ");
   //reading number
   scanf("%f",&number);
   //if both are equal,return 0
   if(num==number)
       return 0;
   //if num is less than user enterd double,return -1
   else if(num<number)
       return -1;
   //if num is greater than user enterd double,return 1
   else
       return 1;
}

Complete program

#include<stdio.h>
//function prototype declaration
int compareNum(double);
int main(void)
{
   //declaring double variable d
   double n;
   //integer variable result
   int result;
   //prompt to enter double number
   printf("Enter a double number: ");
   //reading number
   scanf("%f",&n);
   //calling compareNum() function
   result=compareNum(n);
   //printing returned value
   printf("%d",result);
   return 0;  
}
int compareNum(double num)
{
   //declaring double variable number
   double number;
   //prompt user to enter number
   printf("Enter a number: ");
   //reading number
   scanf("%f",&number);
   //if both are equal,return 0
   if(num==number)
       return 0;
   //if num is less than user enterd double,return -1
   else if(num<number)
       return -1;
   //if num is greater than user enterd double,return 1
   else
       return 1;  
}

Screen shot of the code

Screen shot of the output