View Compilation Error

0_0_33000961_17100.c: In function 'main':
0_0_33000961_17100.c:18:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i = 1;i<=k;i++)
         ^
0_0_33000961_17100.c:18:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_33000961_17100.c:20:17: error: redefinition of 'i'
         for(int i = 1;i<=k-1;i++)
                 ^
0_0_33000961_17100.c:18:17: note: previous definition of 'i' was here
         for(int i = 1;i<=k;i++)
                 ^
0_0_33000961_17100.c:20:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i = 1;i<=k-1;i++)
         ^
0_0_33000961_17100.c:23:17: error: redefinition of 'i'
         for(int i = 2;i<=k;i++)
                 ^
0_0_33000961_17100.c:20:17: note: previous definition of 'i' was here
         for(int i = 1;i<=k-1;i++)
                 ^
0_0_33000961_17100.c:23:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int i = 2;i<=k;i++)
         ^