View Compilation Error

0_0_27189146_14386.c: In function 'main':
0_0_27189146_14386.c:12:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int c= 0;c<n;c++){
         ^
0_0_27189146_14386.c:12:9: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_27189146_14386.c:15:17: error: redefinition of 'c'
         for(int c=0;c<n;c++){
                 ^
0_0_27189146_14386.c:12:17: note: previous definition of 'c' was here
         for(int c= 0;c<n;c++){
                 ^
0_0_27189146_14386.c:15:9: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
         for(int c=0;c<n;c++){
         ^