0_0_29899789_23453.c: In function 'main':
0_0_29899789_23453.c:16:2: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=3;i<=20;i++)
^
0_0_29899789_23453.c:16:2: note: use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 to compile your code
0_0_29899789_23453.c:25:3: error: 'for' loop initial declarations are only allowed in C99 or C11 mode
for(int i=0;i<=n-1;i++)
^
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