C Program

#include <stdio.h>
    int oddsum(int n){
    
    int i, sum=0;
   
    printf("Enter Number: ");
    scanf("%d", &n);
    
    for(i=1; i<=n; i+=2)
    {
        sum += i;
    }

    printf("Sum of odd numbers = %d", sum);

    return 0;
    
}

int main()
{
    oddsum(12);
}

#include<stdio.h> 
#include<string.h> 


void generateSquare(int n) 
{ 
	int magicSquare[n][n]; 

	
	memset(magicSquare, 0, sizeof(magicSquare)); 


	int i = n/2; 
	int j = n-1; 

	
	for (int num=1; num <= n*n; ) 
	{ 
		if (i==-1 && j==n) //3rd condition 
		{ 
			j = n-2; 
			i = 0; 
		} 
		else
		{ 
			
			if (j == n) 
				j = 0; 

		
			if (i < 0) 
				i=n-1; 
		} 
		if (magicSquare[i][j]) //2nd condition 
		{ 
			j -= 2; 
			i++; 
			continue; 
		} 
		else
			magicSquare[i][j] = num++; //set number 

		j++; i--; //1st condition 
	} 


	printf("The Magic Square for n=%d:\nSum of "
	"each row or column %d:\n\n", n, n*(n*n+1)/2); 
	for (i=0; i<n; i++) 
	{ 
		for (j=0; j<n; j++) 
			printf("%3d ", magicSquare[i][j]); 
		printf("\n"); 
	} 
} 


int main() 
{ 
	int n = 3; 
	generateSquare (n); 
	return 0; 
}