View Compilation Error

0_0_28658186_12020.c: In function 'main':
0_0_28658186_12020.c:12:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i = 1; i <= num; i+)
         ^
0_0_28658186_12020.c:12:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_28658186_12020.c:12:36: error: expected expression before ')' token
         for(int i = 1; i <= num; i+)
                                    ^