Program in C to interchange largest and smallest element in an Array

\* C Program to to interchange largest and smallest element in an Array *\

# include < stdio.h >
int   main( )
{

int   a[20], b[20], n, sml=0, lar=0, i, spos, lpos, temp  ;
printf(" Enter the Numbers of terms: ") ;
scanf("%d ", & n) ;
printf("\n Enter the terms : \n") ;
for (  i = 1 ; i < = n ; i++ )
{

scanf("%d ", & a[i]) ;
b[i] = a[i] ;

}
sml = a[1] ;
for (  i = 1 ; i < = n ; i++ )
{

if ( a[i] <= sml )
{

sml = a[i] ;
spos = i ;

}
if ( lar <= a[i] )
{

lar = a[i] ;
lpos = i ;

}

}
temp = a[spos] ;
a[spos] = a[lpos] ;
a[lpos] = temp ;

printf("\n The Array enter by user are :\n") ;
for (  i = 1 ; i < = n ; i++ )
printf(" %d \t", b[i]) ;

printf("\n The Array after interchanging the largenst and smallest element :\n") ;
for (  i = 1 ; i < = n ; i++ )
printf(" %d \t", a[i]) ;
return ( 0 ) ;

}