View Compilation Error

0_0_31890375_3127.c: In function 'cmp':
0_0_31890375_3127.c:11:37: error: expected declaration specifiers before '/' token
 int cmp(const void *a,const void *b)//a-z
                                     ^
0_0_31890375_3127.c:19:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
0_0_31890375_3127.c:27:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
 {
 ^
0_0_31890375_3127.c:11:5: error: old-style parameter declarations in prototyped function definition
 int cmp(const void *a,const void *b)//a-z
     ^
0_0_31890375_3127.c:74:1: error: expected '{' at end of input
 }
 ^