View Compilation Error

0_0_31261567_12792.c: In function 'main':
0_0_31261567_12792.c:11:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int i=1;i<=n;i++)
             ^
0_0_31261567_12792.c:11:13: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_31261567_12792.c:16:21: error: redefinition of 'i'
             for(int i=1;i<=n+1;i++)
                     ^
0_0_31261567_12792.c:11:21: note: previous definition of 'i' was here
             for(int i=1;i<=n;i++)
                     ^
0_0_31261567_12792.c:16:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int i=1;i<=n+1;i++)
             ^
0_0_31261567_12792.c:19:17: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
                 for(int j=0;j<i;j++)
                 ^