View Compilation Error

0_0_24972020_18111.c: In function 'main':
0_0_24972020_18111.c:29:1: error: expected expression before '/' token
 //            int cnt;
 ^
0_0_24972020_18111.c:30:1: error: expected expression before '/' token
 //            for(cnt=0;cnt<sizeof(sum);cnt++)putchar(sum[cnt]|0x30);
 ^
0_0_24972020_18111.c:31:1: error: expected expression before '/' token
 //            putchar('\n');
 ^