View Compilation Error

0_0_17259564_20600.c: In function 'main':
0_0_17259564_20600.c:8:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++) scanf("%lf%lf",&x[i],&y[i]);
   ^
0_0_17259564_20600.c:8:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_17259564_20600.c:11:11: error: redefinition of 'i'
   for(int i=0;i<n;i++){
           ^
0_0_17259564_20600.c:8:11: note: previous definition of 'i' was here
   for(int i=0;i<n;i++) scanf("%lf%lf",&x[i],&y[i]);
           ^
0_0_17259564_20600.c:11:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for(int i=0;i<n;i++){
   ^
0_0_17259564_20600.c:12:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for(int j=i+1;j<n;j++){
    ^