My program is not working when I use scanf function

Question

Sololearn Code:

#include <stdio.h>

/* declaration */
int square (int num);

int main() {
int x, result;

x = 5;
result = square(x);
printf("%d squared is %d\n", x, result);

return 0;
}

/* definition */
int square (int num) {
int y;

y = num * num;

return(y);
}

Modified by me
using scanf() funcation

#include<stdio.h>

//Declaration//
int square (int num);

int main()
{
int x;
int result;
result= square (x) ;
scanf("%d", &x);
printf ("%d Square is %d\n", x, result);

return 0;
}

// Declearation //

int square (int num) {

int y;
y= num * num;

return (y);

}

Answer 1

That's because you are trying to calculate square of the number before inputting that number.

Here's the fix👇
https://code.sololearn.com/cqbUXlQAwZ23/?ref=app

Answer 2

You are using scanf after calling the function ,😐
int=square(x) ,

Answer 3

Thank you both of you