View Compilation Error

0_0_20766971_16854.c: In function 'main':
0_0_20766971_16854.c:29:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0;i < 46;i++)
   ^
0_0_20766971_16854.c:29:3: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_20766971_16854.c:35:12: error: redefinition of 'i'
   for (int i = 0;i <= max_n;i++)
            ^
0_0_20766971_16854.c:29:12: note: previous definition of 'i' was here
   for (int i = 0;i < 46;i++)
            ^
0_0_20766971_16854.c:35:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
   for (int i = 0;i <= max_n;i++)
   ^
0_0_20766971_16854.c:36:4: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
    for (int j= sushu[i];j <= num;j++)
    ^