View Compilation Error

0_0_33421963_16513.c: In function 'main':
0_0_33421963_16513.c:11:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=0;i<num;i++){
         ^
0_0_33421963_16513.c:11:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_33421963_16513.c:19:17: error: redefinition of 'i'
         for(int i=1;i<num;i++){
                 ^
0_0_33421963_16513.c:11:17: note: previous definition of 'i' was here
         for(int i=0;i<num;i++){
                 ^
0_0_33421963_16513.c:19:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i=1;i<num;i++){
         ^
0_0_33421963_16513.c:20:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int j=0;j<N;j++){
             ^