C Exercises: Check which number nearest to the value 100 among two given integers

Last update on March 18 2025 13:26:16 (UTC/GMT +8 hours)

10. Nearest to 100

Write a C program to check which number is nearest to the value 100 among two given integers. Return 0 if the two numbers are equal.

C Code:

#include <stdio.h>  // Include standard input/output library
#include <stdlib.h> // Include standard library for additional functions

// Declare the function 'test' with two integer parameters
int test(int x, int y);

int main(void)
{
    // Call the function 'test' with arguments 78 and 95, and print the result
    printf("%d", test(78, 95));

    // Print a newline for formatting
    printf("\n");

    // Call the function 'test' with arguments 95 and 95, and print the result
    printf("%d", test(95, 95));

    // Print a newline for formatting
    printf("\n");

    // Call the function 'test' with arguments 99 and 70, and print the result
    printf("%d", test(99, 70));
}

// Function definition for 'test'
int test(int x, int y)
{
    int n = 100;      // Define a variable 'n' and assign it the value 100
    int val = abs(x - n);  // Calculate the absolute difference between 'x' and 'n' and store it in 'val'
    int val2 = abs(y - n); // Calculate the absolute difference between 'y' and 'n' and store it in 'val2'

    // Check if 'val' is equal to 'val2'. If true, return 0. Otherwise, return 'x' if 'val' is less than 'val2', otherwise return 'y'.
    return val == val2 ? 0 : (val < val2 ? x : y);
}

Sample Output:

95
0
99

Explanation:

int test(int x, int y) {
  int n = 100;
  int val = abs(x - n);
  int val2 = abs(y - n);
  return val == val2 ? 0 : (val < val2 ? x : y);
}

The above function initializes an integer ‘n’ with a value of 100. Then it initializes two integer variables val and val2 with the absolute difference between ‘x’ and ‘n’ and ‘y’ and ‘n’, respectively.

Next, the function checks if ‘val’ is equal to ‘val2’. If it is, then the function returns 0. Otherwise, the function checks which of the two values ‘val’ and ‘val2’ is smaller. If ‘val’ is smaller, then the function returns ‘x’. If ‘val2’ is smaller, then the function returns ‘y’.

Time complexity and space complexity:

Time complexity: The time complexity of this function is O(1) since the operations performed are simple arithmetic operations and a few conditional statements, and the number of operations is constant regardless of the input size.

Space complexity: The space complexity of this function is O(1) since the function only uses a fixed number of integer variables and does not create any data structures or arrays.

Pictorial Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program that determines which of two numbers is closest to 50, returning 0 if both are equally close.
• Write a C program to find the number nearest to a given target value, with a twist: if both are equal, return -1.
• Write a C program to compare two numbers and return the one closest to a user-defined target, except when both numbers differ by less than 2, then return the sum.
• Write a C program that checks two integers and returns the one that is nearest to 200; if equidistant, return the product of the numbers.

C Programming Code Editor:

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