Program to find Second largest number in an array in c

1. #include"stdio.h"
2. main()
3. {
4. int a[]={15,67,25,90,40};
5. int k;
6. k=large_number(a);
7. printf("%d ",k);
8. }
9. int large_number(int un[5])
10. {
11. int big1,big2;
12. int i;
13. big1 = un[0];
14. for ( i=1;i<5 font="" i="">
15. if ( big1 < un[i] )
16. big1 = un[i];
17. if ( big1!=un[0] )
18. big2=un[0];
19. else
20. big2=un[1];
21. for(i=1; i<5 font="" i="">
22. if (big1!=un[i] && big2 < un[i] )
23. big2=un[i];
24. return big2;
25. }