View Compilation Error

0_0_23675859_30236.c: In function 'Prime':
0_0_23675859_30236.c:13:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i = 2;i *i <100;i++)
     ^
0_0_23675859_30236.c:13:5: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_23675859_30236.c:15:13: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
             for(int j = i*i;j < 100;j += i)
             ^
0_0_23675859_30236.c: In function 'dfs':
0_0_23675859_30236.c:24:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i = 2;i <= n;i++){
     ^
0_0_23675859_30236.c: In function 'Print':
0_0_23675859_30236.c:36:5: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
     for(int i = 1;i <= n;i++)
     ^