In this blog post, we learn how to write a C program to find square of a number?. We will write the C program to find a square of a number. How to display input number square C programming. Logic to find a square of a given number in C programming.

Example,

Input: 2
Output: 4


Input: 20
Output: 400

C Program to calculate the square of a number:

The below program ask the user to enter the value. After getting the value from the user it will calculate the square of entered number by using arithmetic multiplication operator.

#include<stdio.h>

int main()
{
    float number, square;

    printf("Please Enter any integer Value : ");
    scanf("%f", &number);

    square = number * number;

    printf("square of a given number %.2f is  =  %.2f", number, square);

    return 0;
}

Output 1:

Please Enter any integer Value : 20
square of a given number 20.00 is = 400.00

Output 2:

Please Enter any integer Value : 4.5
square of a given number 4.50 is = 20.25

C Program to calculate the square of a number using a function:

The below program ask the user to enter the value. After getting the value from the user it will call a function squareOfNumber() to calculate the square of the entered number.  The function squareOfNumber() is using an arithmetic multiplication operator to calculate the square of the input number.

#include<stdio.h>

//function to calculate square of number
float squareOfNumber(float num)
{
    return (num*num);
}

int main()
{
    float number, square;

    printf("Please Enter any integer Value : ");
    scanf("%f", &number);

    square = squareOfNumber(number);

    printf("square of a given number %.2f is  =  %.2f", number, square);

    return 0;
}

Output:

Please Enter any integer Value : 4.5
square of a given number 4.50 is = 20.25

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