- C Programming Examples
- C Programming Examples
- C Print Hello World
- C Get Input from User
- C Print Integer
- C Add Two Numbers
- C Add Subtract Multiply Divide
- C Add n Numbers
- C Area Perimeter of Square
- C Area Perimeter of Rectangle
- C Area Circum of Circle
- C Fahrenheit to Celsius
- C Celsius to Fahrenheit
- C Inches to Centimeters
- C Kilogram to Gram
- C Reverse a Number
- C Swap Two Numbers
- C Interchange Numbers
- C Print ASCII Value
- C Print Fibonacci Series
- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
- C Find nCr and nPr
- C Find Profit Loss
- C Sum of their Square
- C First & Last Digit Sum
- C Sum of All Digit
- C Product of All Digit
- C Print Total Digit in Number
- C Check Perfect Number
- C Find Basic Gross Salary
- C Round Number to Integer
- C Print Series upto n Term
- C Find Factors of Number
- C if-else & Loop Programs
- C Check Even or Odd
- C Check Prime or Not
- C Check Alphabet or Not
- C Check Vowel or Not
- C Check Leap Year or Not
- C Is Reverse Equal Original
- C Make Calculator
- C Add Digits of Number
- Count Positive Negative Zero
- C Largest of Two Numbers
- C Largest of Three Numbers
- C Smallest of Two Numbers
- C Smallest of Three Numbers
- C Find Factorial of Number
- C Find LCM & HCF
- C Find LCM of n Numbers
- C Find HCF of n Numbers
- C Find Arithmetic Mean
- C Find Average, Percentage
- C Find Student Grade
- C Print Table of Number
- C Print Prime Numbers
- C Find Discount Purchase
- C Calculate Parcel Charge
- C Calculate Wage of Labor
- C Print Phone Bill
- C Conversion programs
- C Decimal to Binary
- C Decimal to Octal
- C Decimal to Hexadecimal
- C Binary to Decimal
- C Binary to Octal
- C Binary to Hexadecimal
- C Octal to Decimal
- C Octal to Binary
- C Octal to Hexadecimal
- C Hexadecimal to Decimal
- C Hexadecimal to Binary
- C Hexadecimal to Octal
- C Pattern Programs
- C Pattern Printing Programs
- C Print Diamond Pattern
- C Print Floyd's Triangle
- C Print Pascal's Triangle
- C Array Programs
- C 1D Array Programs
- C Linear Search
- C Binary Search
- C Largest Element in Array
- C Smallest Element in Array
- C Second Largest/Smallest
- C Count Even Odd
- C Array Element at Even
- C Array Element at Odd
- C Print Even Array Elements
- C Print Odd Array Elements
- C Sum/Product of Even/Odd
- C Reverse an Array
- C Insert Element in Array
- C Delete Element from Array
- C Merge Two Arrays
- C Bubble Sort
- C Selection Sort
- C Insertion Sort
- C Print Common Elements
- C 2D Array Programs
- C Add Two Matrices
- C Subtract Two Matrices
- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
- C Print Row Column Total
- C 3D Array Programs
- C String Programs
- C Print String
- C Find Length of String
- C Compare Two String
- C Copy a String
- C Concatenate String
- C Reverse a String
- C Count Vowels Consonants
- C Replace Vowel in String
- C Delete Vowels from String
- C Delete Word from String
- C Frequency of Character
- C Count Word in String
- C Remove Spaces from String
- C Sort a String
- C Sort String in Alphabetical
- C Sort Words in Ascending
- C Sort Words in Descending
- C Uppercase to Lowercase
- C Lowercase to Uppercase
- C Swap Two Strings
- C Check Anagram or Not
- C Check Palindrome String
- C Print Number in Words
- C Print Successive Character
- C Character without Space
- C File Programs
- C Read a File
- C Write Content to File
- C Read & Display File
- C Copy a File
- C Merge Two Files
- C Reverse File
- C Count All Character in File
- C List Files in Directory
- C Encrypt & Decrypt a File
- C Delete a File
- C Misc Programs
- Generate Random Numbers
- C Print Date Time
- C Print Message with Time
- C Get IP Address
- C Print Smiling face
- C Pass Array to Function
- Add Two Numbers using Pointer
- C Address of Variable
- C Shutdown Computer
- C Programming Tutorial
- C Tutorial

# C Program to Round Off a Decimal or Floating-Point Number

In this tutorial, we will learn how to create a program in C that will ask the user to enter any number (any real or floating-point number) to round it off to the nearest integer. For example, if the user has provided 23.43 as input, then the program will output its nearest integer value, which will be 23. Let's take a look at the program:

#include<stdio.h> #include<conio.h> int main() { float num; int tempCheck, roundNum, tempNum; printf("Enter the number: "); scanf("%f", &num); if(num>0) { tempNum = num*10; tempCheck = tempNum%10; if(tempCheck>=5) { roundNum = num; roundNum++; } else { roundNum = num; } printf("\nWhole number after rounding off the given real number = %d", roundNum); } else if(num<0) { num = -(num); tempNum = num*10; tempCheck = tempNum%10; if(tempCheck>=5) { roundNum = num; roundNum--; } else { roundNum = num; } printf("\nWhole number after rounding off the given real number = -%d", roundNum); } else { printf("\nThe given number is 0"); } getch(); return 0; }

Because the above program was written in the Code::Blocks IDE, the output will be similar to the one shown below after a successful build and run. This is the first snapshot of the sample run:

Now supply any real number, say 37.5, and press the ENTER key to see the nearest integer (whole number) value of the given real number:

Here is another sample run of the above program; this time let's suppose the user has provided the real number, say -25.56, as input:

Here is a list of some of the main steps used in the above program:

- Receive any real number as input.
- Now Use two if statements to round it off. First, when the user has supplied the real number, which is positive. Second, when the user has supplied the real number, which is negative.
- Now if the given number is a positive number, then multiply the number by 10 and initialize
it to a variable, say
**tempNum**. Then find the remainder of**tempNum**(by dividing by 10) and initialize it to another variable, say**tempCheck**. Check whether the**tempCheck**variable holds a value that is greater than 5 or not. If it is, then initialize the value of**num**to another variable, say**roundNum**, and increment it by 1. Then, at last, print the value of**roundNum**, which will be the nearest integer value of the given number. - And if the given number is a negative number, then first make it a positive number just by
multiplying the number with the
**minus (-)**operator. Do the same steps as done in the case of a positive number, except that this time we have to decrement the value of**roundNum**, as in the case of a negative number, a greater number means a smaller value. That is, 34 is greater than 33, but -34 is less than -33. - For example, if the user has supplied 33.45 as input, then program flow goes inside the first
**if**block because**33.45**is greater than 0. - Inside the
**if**block,**num*10**or**33.45*10**or**334.5**will be initialized to**tempNum**, and**tempNum%10**or**334.5%10**or**4**will be initialized to**tempCheck**. **Note**: Here we have multiplied the number by 10 and then applied the modulus operator (%) to make the first digit present after the decimal come before the decimal. So that we can check the number by using the modulus operator to see if it is greater than or equal to 5 (that comes after the decimal). That is, if the number is greater than or equal to 5, then we have to increment the value and print it as the nearest integer of the given number, and if the number is less than 5, then print the number as it is (without having a decimal part).- Now come to the example. As
**tempCheck**holds**4**, which is less than 5, the program flow goes inside the**else**block, and**num**will be initialized to**roundNum**. And print the value of**roundNum**. - And if user has provided
**-34.67**as input, then, as the number is less than 0, the program flow goes inside the**else if**block. - The number is multiplied by the minus operator (-) and initialized to the number itself, for example,
**-(num)**or**-(-34.67)**or**34.67**will be initialized to**num**,**num*10**or**34.67*10**or**346.7**will be initialized to**tempNum**, and**tempNum%10**or**346.7%10**or**6**will be initialized to**tempCheck**. - As the
**tempCheck**variable holds a value that is greater than 5, program flow goes inside the**if**block,**num**will be initialized to**roundNum**, and the value gets decremented. Finally, print the value, which will be 33, as output.

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