Program in C to merge two unsorted array in descending order

\* C Program to to merge two unsorted array in descending order *\

# include < stdio.h >
int   main( )
{

int   a[25], b[25], sum[50], i, j, k=1, n, m, s, temp  ;
printf(" Enter the number of element in first array : ") ;
scanf("%d ", & n) ;
printf("\n Enter the element of araay : \n") ;
for (  i = 1 ; i < = n ; i++ )
scanf("%d ", & a[i]) ;

printf(" Enter the number of element in second array : ") ;
scanf("%d ", & m) ;
printf("\n Enter the element of araay : \n") ;
for (  i = 1 ; i < = m ; i++ )
scanf("%d ", & b[i]) ;
s = m + n ;

for (  i = 1 ; i <= s ; i++ )
{

if (  i <= n  )
sum[i] = a[i] ;
else
{

sum[i] = b[k] ;
k = k+1 ;

}

}

for (  i = 1 ; i <= s ; i++ )
{

for (  j = 1 ; j <= s ; j++ )
{

if (  sum[i] >= sum[j]  )
{

temp = sum[i] ;
sum[i] = sum[j] ;
sum[j] = temp ;

}

}

}
printf("\n Element of array after merging and sorting :\n") ;
for (  i = 1 ; i <= s ; i++ )
pcanf("%d \t", sum[i]) ;
return ( 0 ) ;

}